Godin Tepe is an archaeological site in western Iran , located in the valley of Kangavar in Kermanshah province . The importance of the site may have been due to its role as a trading outpost in the early Mesopotamian trade networks.
170-498: Brewing is the production of beer by steeping a starch source (commonly cereal grains, the most popular of which is barley ) in water and fermenting the resulting sweet liquid with yeast . It may be done in a brewery by a commercial brewer, at home by a homebrewer , or communally. Brewing has taken place since around the 6th millennium BC, and archaeological evidence suggests that emerging civilizations, including ancient Egypt , China , and Mesopotamia , brewed beer. Since
340-591: A "mash tun" – an insulated brewing vessel with a false bottom . The end product of mashing is called a "mash". Mashing usually takes 1 to 2 hours, and during this time the various temperature rests activate different enzymes depending upon the type of malt being used, its modification level, and the intention of the brewer. The activity of these enzymes convert the starches of the grains to dextrins and then to fermentable sugars such as maltose . A mash rest from 49–55 °C (120–131 °F) activates various proteases , which break down proteins that might otherwise cause
510-421: A beer tap at its base. Beer contains the phenolic acids 4-hydroxyphenylacetic acid , vanillic acid , caffeic acid , syringic acid , p -coumaric acid , ferulic acid , and sinapic acid . Alkaline hydrolysis experiments show that most of the phenolic acids are present as bound forms and only a small portion can be detected as free compounds. Hops , and beer made with it, contain 8-prenylnaringenin which
680-605: A beer with the consistency of gruel, used by the semi-nomadic Natufians for ritual feasting, at the Raqefet Cave in the Carmel Mountains near Haifa in northern Israel . There is evidence that beer was produced at Göbekli Tepe during the Pre-Pottery Neolithic (around 8500 BC to 5500 BC ). The earliest clear chemical evidence of beer produced from barley dates to about 3500–3100 BC , from
850-668: A cool temperature, the preservative nature will decrease. Brewing is the sole major commercial use of hops. Yeast is the microorganism that is responsible for fermentation in beer. Yeast metabolises the sugars extracted from grains, which produces alcohol and carbon dioxide , and thereby turns wort into beer. In addition to fermenting the beer, yeast influences the character and flavour. The dominant types of yeast used to make beer are Saccharomyces cerevisiae , known as ale yeast, and Saccharomyces pastorianus , known as lager yeast; Brettanomyces ferments lambics , and Torulaspora delbrueckii ferments Bavarian weissbier . Before
1020-407: A cooling medium which can be cooled to below the freezing point , which allows a finer control over the wort-out temperature, and also enables cooling to around 10 °C (50 °F). After cooling, oxygen is often dissolved into the wort to revitalize the yeast and aid its reproduction. While boiling, it is useful to recover some of the energy used to boil the wort. On its way out of the brewery,
1190-428: A cup in the centre. The principle in all is that by swirling the wort the centripetal force will push the trub into a cone at the centre of the bottom of the tank, where it can be easily removed. A hopback is a traditional additional chamber that acts as a sieve or filter by using whole hops to clear debris (or " trub ") from the unfermented (or "green") wort , as the whirlpool does, and also to increase hop aroma in
1360-416: A daily ration of four to five litres of beer, which served as both nutrition and refreshment and was crucial to the pyramids' construction. Some of the earliest Sumerian writings contain references to beer; examples include a prayer to the goddess Ninkasi , known as "The Hymn to Ninkasi", which served as both a prayer and a method of remembering the recipe for beer in a culture with few literate people, and
1530-539: A degree that brewers of pale ale add gypsum in a process known as Burtonisation . The starch source provides the fermentable material and determines the strength and flavour of the beer. The most common starch source used in beer is malted grain. Grain is malted by soaking it in water, allowing it to begin germination , and then drying the partially germinated grain in a kiln. Malting produces enzymes that convert starches into fermentable sugars. Different roasting times and temperatures produce different colours of malt from
1700-424: A degree that brewers of pale ales will add gypsum to the local water in a process known as Burtonisation . The starch source in a beer provides the fermentable material and is a key determinant of the strength and flavour of the beer. The most common starch source used in beer is malted grain. Grain is malted by soaking it in water, allowing it to begin germination , and then drying the partially germinated grain in
1870-431: A dense head and a creamy mouthfeel . In the 1980s, Guinness introduced the beer widget , a nitrogen-pressurised ball inside a can which creates a moderately dense, tight head. This approximates the effect of serving from a keg, at least for a British-style beer which does not have a specially large head. Cask-conditioned ales (or cask ales) are unfiltered and unpasteurised beers. These beers are termed " real ale " by
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#17328443129652040-481: A document from that year refers to a hop garden in the area paying a tithe to the monastery. It claims to be the oldest working brewery in the world. Top-fermented beers are most commonly produced with Saccharomyces cerevisiae , a top-fermenting yeast which clumps and rises to the surface, typically between 15 and 25 °C (59 and 77 °F). At these temperatures, yeast produces significant amounts of esters and other secondary flavour and aroma products, and
2210-487: A domestic scale, although by the 7th century AD beer was also being produced and sold by European monasteries . During the Industrial Revolution, the production of beer moved from artisanal manufacture to industrial manufacture , and domestic manufacture ceased to be significant by the end of the 19th century. The development of hydrometers and thermometers changed brewing by allowing the brewer more control of
2380-571: A feature, such as adding wheat to aid in retaining the foamy head of the beer. The most common starch source is ground cereal or "grist" - the proportion of the starch or cereal ingredients in a beer recipe may be called grist, grain bill, or simply mash ingredients . Steps in the brewing process include malting , milling , mashing , lautering , boiling , fermenting , conditioning , filtering , and packaging . There are three main fermentation methods: warm , cool and spontaneous . Fermentation may take place in an open or closed fermenting vessel;
2550-495: A fine powder such as diatomaceous earth (also called kieselguhr), which is added to the beer to form a filtration bed which allows liquid to pass, but holds onto suspended particles such as yeast. Filters range from rough filters that remove much of the yeast and any solids (e.g., hops, grain particles) left in the beer, to filters tight enough to strain colour and body from the beer. Filtration ratings are divided into rough, fine, and sterile. Rough filtration leaves some cloudiness in
2720-403: A kiln. Malting grain produces enzymes that will allow conversion from starches in the grain into fermentable sugars during the mash process. Different roasting times and temperatures are used to produce different colours of malt from the same grain. Darker malts will produce darker beers. Nearly all beer includes barley malt as the majority of the starch. This is because of its fibrous husk, which
2890-401: A less hazy product. Some beers undergo an additional fermentation in the bottle giving natural carbonation. This may be a second and/or third fermentation. They are bottled with a viable yeast population in suspension. If there is no residual fermentable sugar left, sugar or wort or both may be added in a process known as priming. The resulting fermentation generates CO 2 that is trapped in
3060-534: A medical context, alcoholism is said to exist when two or more of the following conditions are present: a person drinks large amounts over a long time period, has difficulty cutting down, acquiring and drinking alcohol takes up a great deal of time, alcohol is strongly desired, usage results in not fulfilling responsibilities, usage results in social problems, usage results in health problems, usage results in risky situations, withdrawal occurs when stopping, and alcohol tolerance has occurred with use. Alcoholism reduces
3230-555: A natural preservative and stabilising agent . Other flavouring agents, such as gruit , herbs, or fruits, may be included or used instead of hops. In commercial brewing, natural carbonation is often replaced with forced carbonation. Beer is distributed in bottles and cans, and is commonly available on draught in pubs and bars. The brewing industry is a global business, consisting of several dominant multinational companies and many thousands of smaller producers ranging from brewpubs to regional breweries . The strength of modern beer
3400-408: A non-profit UK beer organisation, has set a temperature standard range of 12°–14 °C (53°–57 °F) for cask ales to be served. Beer is consumed out of a variety of vessels, such as a glass, a beer stein , a mug, a pewter tankard , a beer bottle or a can; or at music festivals and some bars and nightclubs, from a plastic cup. The shape of the glass from which beer is consumed can influence
3570-422: A number of plastered hearths. T. Cuyler Young Jr. defined three main groups of pottery for Level IV. Two of these groups belong to Transcaucasian Early Bronze Age Culture. One of these groups bears two types of coarse ware tempered with coarse grit. One of these types is characterized by a grey-black burnished surface mostly with contrasting colours in the interior and exterior of the vessels. This type of coarse ware
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#17328443129653740-466: A particular purpose, such as brewing beers with a high abv. Brewers in Bavaria had for centuries been selecting cold-fermenting yeasts by storing ("lagern") their beers in cold alpine caves. The process of natural selection meant that the wild yeasts that were most cold tolerant would be the ones that would remain actively fermenting in the beer that was stored in the caves. A sample of these Bavarian yeasts
3910-589: A person's life expectancy by around ten years and alcohol use is the third leading cause of early death in the United States. No professional medical association recommends that people who are nondrinkers should start drinking alcoholic beverages. In the United States, a total of 3.3 million deaths per year (5.9% of all deaths) are believed to be due to alcohol. Godin Tepe The earliest evidence for occupation at Godin comes from Periods XI through VII, spanning
4080-608: A popular semi-fermented rice/millet drink in the eastern Himalayas . The Andes in South America has Chicha , made from germinated maize (corn); while the indigenous peoples in Brazil have Cauim , a traditional drink made since pre-Columbian times by chewing manioc so that an enzyme ( amylase ) present in human saliva can break down the starch into fermentable sugars; this is similar to Masato in Peru . Beers made from bread , among
4250-442: A seal less prone to leaking over time than bottles. Cans were initially viewed as a technological breakthrough for maintaining the quality of a beer, then became commonly associated with less expensive, mass-produced beers, even though the quality of storage in cans is much like bottles. Plastic ( PET ) bottles are used by some breweries. The temperature of a beer has an influence on a drinker's experience; warmer temperatures reveal
4420-531: A secondary carbohydrate source, such as maize (corn), rice, wheat, or sugar, often termed an adjunct , especially when used alongside malted barley. Less widely used starch sources include millet , sorghum , and cassava root in Africa; potato in Brazil; and agave in Mexico. Water is the main ingredient, accounting for 93% of beer's weight. The level of dissolved bicarbonate influences beer's finished taste. Due to
4590-587: A secondary fermentation may also occur in the cask or bottle . There are several additional brewing methods , such as Burtonisation , double dropping , and Yorkshire Square , as well as post-fermentation treatment such as filtering , and barrel-ageing . Brewing has taken place since around the 6th millennium BC, and archaeological evidence suggests emerging civilizations including China , ancient Egypt , and Mesopotamia brewed beer. Descriptions of various beer recipes can be found in cuneiform (the oldest known writing) from ancient Mesopotamia . In Mesopotamia
4760-414: A section of them. Filtering stabilises the flavour of beer, holding it at a point acceptable to the brewer, and preventing further development from the yeast, which under poor conditions can release negative components and flavours. Filtering also removes haze, clearing the beer, and so giving it a "polished shine and brilliance". Beer with a clear appearance has been commercially desirable for brewers since
4930-472: A single group of nondrinkers, which hides the health benefits of lifelong abstention from ethanol. The long-term health effects of continuous, moderate or heavy alcohol consumption include the risk of developing alcoholism and alcoholic liver disease . Alcoholism , also known as "alcohol use disorder", is a broad term for any drinking of alcohol that results in problems. It was previously divided into two types: alcohol abuse and alcohol dependence . In
5100-401: A solid) out of the beer along with protein solids and are found only in trace amounts in the finished product. This process makes the beer appear bright and clean, rather than the cloudy appearance of ethnic and older styles of beer such as wheat beers . Examples of clarifying agents include isinglass , obtained from swim bladders of fish; Irish moss , a seaweed; kappa carrageenan , from
5270-404: A source of bitterness, flavour, and aroma. The longer the hops are boiled, the more bitterness they contribute, but the less hop flavour and aroma remain. The wort is cooled and the yeast is added. The wort is then fermented, often for a week or longer. The yeast settles, leaving the beer clear. During fermentation, most of the carbon dioxide is allowed to escape through a trap . The carbonation
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5440-597: A starch source, such as malted barley , able to be fermented (converted into alcohol); a brewer's yeast to produce the fermentation; and a flavouring, such as hops , to offset the sweetness of the malt. A mixture of starch sources may be used, with a secondary saccharide, such as maize (corn), rice, or sugar, these often being termed adjuncts , especially when used as a lower-cost substitute for malted barley. Less widely used starch sources include millet , sorghum , and cassava root in Africa, potato in Brazil, and agave in Mexico, among others. The most common starch source
5610-411: A store or a bar, rather than buying pre-bottled beer, can reduce the environmental impact of beer consumption. Most beers are cleared of yeast by filtering when packaged in bottles and cans. However, bottle conditioned beers retain some yeast—either by being unfiltered, or by being filtered and then reseeded with fresh yeast. Many beers are sold in cans, though there is considerable variation in
5780-533: A strong, sweet drink rather like mead or cider . Whatever the case, the meaning of bēor expanded to cover the meaning of ale . When hopped ale from Europe was imported into Britain in the late Middle Ages, it was described as 'beer' to differentiate it from the British unhopped ale, later acquiring a broader meaning. Beer is one of the world's oldest prepared alcoholic drinks. The earliest archaeological evidence of fermentation consists of 13,000 year-old residues of
5950-539: A very few breweries still use wooden vats for fermentation as wood is difficult to keep clean and infection-free and must be repitched more or less yearly. There are three main fermentation methods, warm , cool , and wild or spontaneous . Fermentation may take place in open or closed vessels. There may be a secondary fermentation which can take place in the brewery, in the cask or in the bottle . Brewing yeasts are traditionally classed as "top-cropping" (or "top-fermenting") and "bottom-cropping" (or "bottom-fermenting");
6120-458: A year. A brewpub is a type of microbrewery that incorporates a pub or other drinking establishment . The highest density of breweries in the world, most of them microbreweries, exists in Franconia , Germany, especially in the district of Upper Franconia , which has about 200 breweries. The Benedictine Weihenstephan brewery in Bavaria , Germany, can trace its roots to the year 768, as
6290-413: Is a plate-and-frame filter. The empty frames contain the mash, including the spent grains, and have a capacity of around one hectoliter. The plates contain a support structure for the filter cloth. The plates, frames, and filter cloths are arranged in a carrier frame like so: frame, cloth, plate, cloth, with plates at each end of the structure. Newer mash filters have bladders that can press the liquid out of
6460-423: Is a potent phytoestrogen . Hop also contains myrcene , humulene , xanthohumol , isoxanthohumol , myrcenol , linalool , tannins, and resin . The alcohol 2M2B is a component of hops brewing. Barley, in the form of malt, brings the condensed tannins prodelphinidins B3 , B9 and C2 into beer. Tryptophol , tyrosol , and phenylethanol are aromatic higher alcohols ( congeners ) produced by yeast during
6630-496: Is a preservative. Yeast is the microorganism responsible for fermenting beer. It metabolises the sugars, producing ethanol and carbon dioxide , and thereby turns wort into beer. In addition, yeast influences the character and flavour. The dominant types of beer yeast are top-fermenting Saccharomyces cerevisiae and bottom-fermenting Saccharomyces pastorianus . Brettanomyces ferments lambics , and Torulaspora delbrueckii ferments Bavarian weissbier . Before
6800-422: Is a tank with holes in the bottom small enough to hold back the large bits of grist and hulls (the ground or milled cereal). The bed of grist that settles on it is the actual filter. Some lauter tuns have provision for rotating rakes or knives to cut into the bed of grist to maintain good flow. The knives can be turned so they push the grain, a feature used to drive the spent grain out of the vessel. The mash filter
6970-435: Is added to the finished beer. The active yeast will restart fermentation in the finished beer, and so introduce fresh carbon dioxide; the conditioning tank will be then sealed so that the carbon dioxide is dissolved into the beer producing a lively "condition" or level of carbonation. The kräusening method may also be used to condition bottled beer. Lagers are stored at cellar temperature or below for 1–6 months while still on
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7140-476: Is another prehistoric site located to the northwest of Godin in this Kangavar area. It also features Dalma pottery. Level VIII is dated 4200–4000 BC, contemporary with Terminal Ubaid period . According to Mitchell Rothman, at this time, during the Late Chalcolithic 1 period (LC 1), some substantial trading networks emerged in the area for trade in metals, and in precious or semi-precious stones, "During
7310-403: Is brewed with a large proportion of wheat although it often also contains a significant proportion of malted barley . Wheat beers are usually top-fermented . Stout is a dark beer made using roasted barley, and typically brewed with slow fermenting yeast. There are a number of variations including dry stout (such as Guinness ), sweet stout, and Imperial (or Russian) stout. Stout was originally
7480-453: Is brewing. It converts the grain into a sugary liquid called wort and then ferments this into beer in a using yeast . The first step, mixing malted barley with hot water in a mash tun , is " mashing ". The starches are converted to sugars, and the sweet wort is drained off. The grains are washed to extract as much fermentable liquid from the grains as possible. The sweet wort is put into a kettle, or "copper", and boiled. Hops are added as
7650-466: Is called saccharification which occurs between the temperatures 60–70 °C (140–158 °F). The result of the mashing process is a sugar-rich liquid or "wort" , which is then strained through the bottom of the mash tun in a process known as lautering . Prior to lautering, the mash temperature may be raised to about 75–78 °C (167–172 °F) (known as a mashout) to free up more starch and reduce mash viscosity. Additional water may be sprinkled on
7820-465: Is cooled in open vats (called " coolships "), where the yeasts and microbiota present in the brewery (such as Brettanomyces ) are allowed to settle to create a spontaneous fermentation, and are then conditioned or matured in oak barrels for typically one to three years. After an initial or primary fermentation, beer is conditioned , matured or aged, in one of several ways, which can take from 2 to 4 weeks, several months, or several years, depending on
7990-417: Is determined by the malt. The most common colour is a pale amber produced from using pale malts. Pale lager and pale ale are terms used for beers made from malt dried and roasted with the fuel coke . Coke was first used for roasting malt in 1642, but it was not until around 1703 that the term pale ale was used. In terms of sales volume, most of today's beer is based on the pale lager brewed in 1842 in
8160-401: Is fully distributed through the beer while it is fermenting, and both equally flocculate (clump together and precipitate to the bottom of the vessel) when fermentation is finished. By no means do all top-cropping yeasts demonstrate this behaviour, but it features strongly in many English yeasts that may also exhibit chain forming (the failure of budded cells to break from the mother cell), which
8330-709: Is ground cereal or "grist" - the proportion of the starch or cereal ingredients in a beer recipe may be called grist, grain bill, or simply mash ingredients . Beer is composed mostly of water. Regions have water with different mineral components; as a result, different regions were originally better suited to making certain types of beer, thus giving them a regional character. For example, Dublin has hard water well suited to making stout , such as Guinness ; while Pilsen has soft water well suited to making pale lager , such as Pilsner Urquell . The waters of Burton in England contain gypsum , which benefits making pale ale to such
8500-579: Is important not only in the sparging stage of brewing (in which water is washed over the mashed barley grains to form the wort ) but also as a rich source of amylase , a digestive enzyme that facilitates conversion of starch into sugars. Other malted and unmalted grains (including wheat, rice, oats, and rye , and, less frequently, maize (corn) and sorghum) may be used. In recent years, a few brewers have produced gluten-free beer made with sorghum with no barley malt for people who cannot digest gluten -containing grains like wheat, barley, and rye. Hops are
8670-513: Is in the technical sense different from true flocculation. The most common top-cropping brewer's yeast, Saccharomyces cerevisiae , is the same species as the common baking yeast. However, baking and brewing yeasts typically belong to different strains, cultivated to favour different characteristics: baking yeast strains are more aggressive, in order to carbonate dough in the shortest amount of time; brewing yeast strains act slower, but tend to tolerate higher alcohol concentrations (normally 12–15% abv
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#17328443129658840-424: Is kilning when the malt goes through a very high temperature drying in a kiln; with gradual temperature increase over several hours. When kilning is complete, the grains are now termed malt , and they will be milled or crushed to break apart the kernels and expose the cotyledon , which contains the majority of the carbohydrates and sugars; this makes it easier to extract the sugars during mashing. Mashing converts
9010-567: Is less clear in modern brewing with the use of cylindro-conical tanks. Generally, warm-fermented beers, which are usually termed ale , are ready to drink within three weeks after the beginning of fermentation, although some brewers will condition or mature them for several months. When a beer has been brewed using a cool fermentation of around 10 °C (50 °F), compared to typical warm fermentation temperatures of 18 °C (64 °F), then stored (or lagered) for typically several weeks (or months) at temperatures close to freezing point, it
9180-413: Is mashed to convert starch in the grain to sugars , which dissolve in water to form wort . Fermentation of the wort by yeast produces ethanol and carbonation in the beer. Beer is one of the oldest alcoholic drinks in the world, the most widely consumed, and the third most popular drink after water and tea . Most modern beer is brewed with hops , which add bitterness and other flavours and act as
9350-516: Is not a meal in itself. A 2016 systematic review and meta-analysis found that moderate ethanol consumption brought no mortality benefit compared with lifetime abstention from ethanol consumption. Some studies have concluded that drinking small quantities of alcohol (less than one drink in women and two in men, per day) is associated with a decreased risk of heart disease , stroke , diabetes mellitus , and early death. Some of these studies combined former ethanol drinkers and lifelong abstainers into
9520-454: Is often increased either by transferring the beer to a pressure vessel and introducing pressurised carbon dioxide or by transferring it before the fermentation is finished so that carbon dioxide pressure builds up inside the container. The basic ingredients of beer are water; a starch source, usually malted barley ; a brewer's yeast to produce the fermentation; and a flavouring such as hops . A mixture of starch sources may be used, with
9690-458: Is partially frozen and the ice is repeatedly removed, until the desired strength is reached, a process that may class the product as spirits rather than beer. The German brewery Schorschbräu's Schorschbock , a 31% ABV eisbock, and Hair of the Dog 's Dave , a 29% abv barley wine made in 1994, used the same fractional freezing method. A 60% ABV blend of beer with whiskey was jokingly claimed as
9860-441: Is pumped into the heat exchanger, and goes through every other gap between the plates. The cooling medium, usually water from a cold liquor tank , goes through the other gaps. The ridges in the plates ensure turbulent flow. A good heat exchanger can drop 95 °C (203 °F) wort to 20 °C (68 °F) while warming the cooling medium from about 10 °C (50 °F) to 80 °C (176 °F). The last few plates often use
10030-419: Is recorded. Before the thirteenth century, beer was flavoured with plants such as yarrow , wild rosemary , and bog myrtle , and other ingredients such as juniper berries , aniseed and ginger , which would be combined into a mixture known as gruit and used as hops are now used; between the thirteenth and the sixteenth century, during which hops took over as the dominant flavouring, beer flavoured with gruit
10200-481: Is represented by a single structure, a fortified, mud brick walled architectural complex (133 m x 55 m) occupied by a Mede chief . The columned halls are in the same architectural tradition of the later Persian halls ( Pasargadae , Susa, Persepolis ), first documented at Hasanlu (V). The Level II pottery (only wheel-made micaceous buff ware) have strong parallels with Iron Age sites as Bābā Jān Tepe (I), Jameh Shuran (IIa), Tepe Nush-i Jan and Pasargadae. Godin
10370-409: Is termed a " lager ". During the lagering or storage phase several flavour components developed during fermentation dissipate, resulting in a "cleaner" flavour. Though it is the slow, cool fermentation and cold conditioning (or lagering) that defines the character of lager, the main technical difference is with the yeast generally used, which is Saccharomyces pastorianus . Technical differences include
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#173284431296510540-873: Is the maximum, though under special treatment some ethanol-tolerant strains can be coaxed up to around 20%). Modern quantitative genomics has revealed the complexity of Saccharomyces species to the extent that yeasts involved in beer and wine production commonly involve hybrids of so-called pure species. As such, the yeasts involved in what has been typically called top-cropping or top-fermenting ale may be both Saccharomyces cerevisiae and complex hybrids of Saccharomyces cerevisiae and Saccharomyces kudriavzevii . Three notable ales, Chimay , Orval and Westmalle , are fermented with these hybrid strains, which are identical to wine yeasts from Switzerland. In general, yeasts such as Saccharomyces cerevisiae are fermented at warm temperatures between 15 and 20 °C (59 and 68 °F), occasionally as high as 24 °C (75 °F), while
10710-419: Is the process in which the beer ages, the flavour becomes smoother, and flavours that are unwanted dissipate. After conditioning for a week to several months, the beer may be filtered and force carbonated for bottling, or fined in the cask . Mashing is the process of combining a mix of milled grain (typically malted barley with supplementary grains such as corn , sorghum , rye or wheat), known as
10880-424: Is the sole commercial use of hops . The flower of the hop vine acts as a flavouring and preservative agent in nearly all beer made today. The flowers themselves are often called "hops". The first historical mention of the use of hops in beer dates from 822 AD in monastery rules written by Adalard of Corbie , though widespread cultivation of hops for use in beer began in the thirteenth century. Before then, beer
11050-620: Is typically around 60°, an angle that will allow the yeast to flow towards the cone's apex, but is not so steep as to take up too much vertical space. CCVs can handle both fermenting and conditioning in the same tank. At the end of fermentation, the yeast and other solids which have fallen to the cone's apex can be simply flushed out of a port at the apex. Open fermentation vessels are also used, often for show in brewpubs, and in Europe in wheat beer fermentation. These vessels have no tops, which makes harvesting top-fermenting yeasts very easy. The open tops of
11220-443: Is used to cool the wort in a heat exchanger, the water is significantly warmed. In an efficient brewery, cold water is passed through the heat exchanger at a rate set to maximize the water's temperature upon exiting. This now-hot water is then stored in a hot water tank. Fermentation takes place in fermentation vessels which come in various forms, from enormous cylindroconical vessels, through open stone vessels, to wooden vats. After
11390-615: Is usually around 4% to 6% alcohol by volume (ABV). Some of the earliest writings mention the production and distribution of beer: the Code of Hammurabi included laws regulating it, while "The Hymn to Ninkasi ", a prayer to the Mesopotamian goddess of beer, contains a recipe for it. Beer forms part of the culture of many nations and is associated with social traditions such as beer festivals , as well as activities like pub crawling , pub quizzes , and pub games . In early forms of English and in
11560-710: Is usually around 4% to 6%, measured as alcohol by volume (ABV). The perceived bitterness is measured by the International Bitterness Units scale (IBU), defined in co-operation between the American Society of Brewing Chemists and the European Brewery Convention . The international scale was a development of the European Bitterness Units scale, often abbreviated as EBU, and the bitterness values should be identical. Beer colour
11730-466: The CAMRA organisation. When a cask arrives in a pub, it is placed horizontally on a " stillage " frame, designed to hold it steady and at the right angle, and then allowed to cool to cellar temperature (typically between 11–13 °C or 52–55 °F), before being tapped and vented—a tap is driven through a rubber bung at the bottom of one end, and a hard spile is used to open a hole in the uppermost side of
11900-464: The Industrial Revolution was made and sold on a domestic scale, although by the 7th century AD, beer was also being produced and sold by European monasteries . During the Industrial Revolution, the production of beer moved from artisanal to industrial manufacture , while domestic production ceased to be significant by the end of the 19th century. In 1912, brown bottles began to be used by
12070-739: The Joseph Schlitz Brewing Company of Milwaukee, Wisconsin , in the United States. This innovation has since been accepted worldwide as it prevents light rays from degrading the quality and stability of beer. The brewing industry is a global business, consisting of several dominant multinational companies and many thousands of smaller producers, ranging from brewpubs to regional breweries . As of 2006, more than 133 billion litres (35 billion US gallons) of beer are sold per year, producing global revenues of US$ 294.5 billion. In 2010, China's beer consumption hit 450 billion litres (120 billion US gallons), or nearly twice that of
12240-457: The Molson Brewery in 1960 to utilise the so-called tea leaf paradox to force the denser solids known as "trub" (coagulated proteins, vegetable matter from hops) into a cone in the centre of the whirlpool tank. Whirlpool systems vary: smaller breweries tend to use the brew kettle, larger breweries use a separate tank, and design will differ, with tank floors either flat, sloped, conical or with
12410-499: The Uruk culture , with parallels at Susa , Uruk (IV) and Nippur The typical Jemdet Nasr tall storage jars, known from Nippur, and the bevelled rim bowls of Uruk are missing however. Cuyler-Young suggested the existence of Elamite trading posts at the site during this period, established by merchants from Susa. Thirteen seal impressions and two cylinder seals were found at level V. They were obviously produced locally, as shown by
12580-497: The mineral properties of each region 's water, specific areas were originally the sole producers of certain types of beer, each identifiable by regional characteristics. Dublin 's hard water is well-suited to making stout , such as Guinness , while the Plzeň Region 's soft water is ideal for brewing Pilsner , such as Pilsner Urquell . The waters of Burton in England contain gypsum , which benefits making pale ale to such
12750-439: The starch in the grain into sugars, typically maltose to create a malty liquid called wort . There are two main methods – infusion mashing, in which the grains are heated in one vessel; and decoction mashing, in which a proportion of the grains are boiled and then returned to the mash, raising the temperature. Mashing involves pauses at certain temperatures (notably 45–62–73 °C or 113–144–163 °F), and takes place in
12920-443: The wort (the liquid containing the sugar extracted during mashing) from the grains. This is done either in a mash tun outfitted with a false bottom, in a lauter tun, or in a mash filter. Most separation processes have two stages: first wort run-off, during which the extract is separated in an undiluted state from the spent grains, and sparging , in which extract which remains with the grains is rinsed off with hot water. The lauter tun
13090-416: The yeast . This in turn creates a beer lower in body and higher in alcohol. A rest closer to the higher end of the range favours α-amylase enzymes, creating more higher-order sugars and dextrins which are less fermentable by the yeast, so a fuller-bodied beer with less alcohol is the result. Duration and pH variances also affect the sugar composition of the resulting wort. Lautering is the separation of
13260-410: The "grist" or "grain bill", and water, known as "liquor", and heating this mixture in a vessel called a "mash tun". Mashing is a form of steeping, and defines the act of brewing, such as with making tea, sake , and soy sauce . Technically, wine, cider and mead are not brewed but rather vinified , as there is no steeping process involving solids. Mashing allows the enzymes in the malt to break down
13430-617: The 21st century, larger breweries have repeatedly absorbed smaller breweries. In 2002, South African Breweries bought the North American Miller Brewing Company to found SABMiller , becoming the second-largest brewery after North American Anheuser-Busch . In 2004, the Belgian Interbrew was the third-largest brewery by volume, and the Brazilian AmBev was the fifth-largest. They merged into InBev , becoming
13600-527: The CO 2 emissions from a 6-pack of micro-brew beer is about 3 kilograms (6.6 pounds). The loss of natural habitat potential from the 6-pack of micro-brew beer is estimated to be 2.5 square metres (26 square feet). Downstream emissions from distribution, retail, storage and disposal of waste can be over 45% of a bottled micro-brew beer's CO 2 emissions. Where legal, the use of a refillable jug, reusable bottle or other reusable containers to transport draught beer from
13770-600: The Early and Middle Chalcolithic . The site was already inhabited as early as c. 5200 BC. Because Godin has such a deep stratigraphy, it was decided that a related site of Seh Gabi nearby should also be studied. Seh Gabi is located 6 km northeast of Godin Tepe in the Kangavar valley. The deeper levels were easier to reach there. Originally, the excavations at Godin concentrated on levels II (ended c. 500 BC?) to V (c. 3200 BC–3000 BC), but
13940-512: The Scandinavian languages, the usual word for beer was the word whose Modern English form is ale . The modern word beer comes into present-day English from Old English bēor , itself from Common Germanic , it is found throughout the West Germanic and North Germanic dialects (modern Dutch and German bier , Old Norse bjórr ). The earlier etymology of the word is debated:
14110-458: The United States, but only 5 per cent sold were premium beers, compared with 50 per cent in France and Germany. Beer is the most widely consumed of all alcoholic drinks. A widely publicised study in 2018 suggested that sudden decreases in barley production due to extreme drought and heat could in the future cause substantial volatility in the availability and price of beer. The process of making beer
14280-430: The ability of lager yeast to metabolize melibiose , and the tendency to settle at the bottom of the fermenter (though ale yeasts can also become bottom settling by selection); though these technical differences are not considered by scientists to be influential in the character or flavour of the finished beer, brewers feel otherwise - sometimes cultivating their own yeast strains which may suit their brewing equipment or for
14450-434: The activity of brewer's yeast over less desirable microorganisms; and they aid in "head retention", the length of time that the foam on top of the beer (the beer head ) will last. The preservative in hops comes from the lupulin glands which contain soft resins with alpha and beta acids. Though much studied, the preservative nature of the soft resins is not yet fully understood, though it has been observed that unless stored at
14620-417: The air, it is possible that beer-like beverages were independently developed throughout the world soon after a tribe or culture had domesticated cereal. Chemical tests of ancient pottery jars reveal that beer was produced as far back as about 7,000 years ago in what is today Iran. This discovery reveals one of the earliest known uses of fermentation and is the earliest evidence of brewing to date. In Mesopotamia,
14790-531: The alcohol content of their beers. Samuel Adams reached 20% ABVwith Millennium , and then surpassed that amount to 25.6% ABV with Utopias . The strongest beer brewed in Britain was Baz's Super Brew by Parish Brewery, a 23% ABVbeer. In September 2011, the Scottish brewery BrewDog produced Ghost Deer, which, at 28%, they claim to be the world's strongest beer produced by fermentation alone. The product claimed to be
14960-554: The ancient advice ("Fill your belly. Day and night make merry") to Gilgamesh , recorded in the Epic of Gilgamesh by the alewife Siduri , may, at least in part, have referred to the consumption of beer. The Ebla tablets , discovered in 1974 in Ebla , Syria , show that beer was produced in the city in 2500 BC. A fermented drink using rice and fruit was made in China around 7000 BC. Unlike sake , mould
15130-422: The beer appear bright and clean, rather than the cloudy appearance of ethnic and older styles such as wheat beers . Clarifying agents include isinglass , from the swimbladders of fish; Irish moss , a seaweed; kappa carrageenan , from the seaweed Kappaphycus cottonii ; Polyclar (artificial); and gelatin . Beer marked "suitable for vegans" is clarified either with seaweed or with artificial agents. In
15300-580: The beer to be hazy. This rest is generally used only with undermodified (i.e. undermalted) malts which are decreasingly popular in Germany and the Czech Republic, or non-malted grains such as corn and rice, which are widely used in North American beers. A mash rest at 60 °C (140 °F) activates β- glucanase , which breaks down gummy β-glucans in the mash, making the sugars flow out more freely later in
15470-400: The beer, but it is noticeably clearer than unfiltered beer. Fine filtration removes almost all cloudiness. Sterile filtration removes almost all microorganisms. Beer Beer is an alcoholic beverage produced by the brewing and fermentation of starches from cereal grain—most commonly malted barley , although wheat , maize (corn), rice , and oats are also used. The grain
15640-400: The beers to continue to ferment, and to clear any sediment. Lager yeast is a cool bottom-fermenting yeast ( Saccharomyces pastorianus ). Lager typically undergoes primary fermentation at 7–12 °C (45–54 °F), and then a long secondary fermentation at 0–4 °C (32–39 °F) (the lagering phase). During the secondary stage, the lager clears and mellows. The cooler conditions inhibit
15810-401: The bottle, remaining in solution and providing natural carbonation. Bottle-conditioned beers may be either filled unfiltered direct from the fermentation or conditioning tank, or filtered and then reseeded with yeast. Cask ale (or cask-conditioned beer) is unfiltered , unpasteurised beer that is conditioned by a secondary fermentation in a metal, plastic or wooden cask. It is dispensed from
15980-497: The brewer's craft was the only profession which derived social sanction and divine protection from female deities/goddesses, specifically: Ninkasi , who covered the production of beer, Siris , who was used in a metonymic way to refer to beer, and Siduri , who covered the enjoyment of beer. In pre-industrial times, and in developing countries, women are frequently the main brewers. As almost any cereal containing certain sugars can undergo spontaneous fermentation due to wild yeasts in
16150-435: The brewer's intention for the beer. The beer is usually transferred into a second container, so that it is no longer exposed to the dead yeast and other debris (also known as " trub ") that have settled to the bottom of the primary fermenter. This prevents the formation of unwanted flavours and harmful compounds such as acetaldehyde . Kräusening (pronounced KROY -zen-ing ) is a conditioning method in which fermenting wort
16320-428: The brewing process. Malting is the process where barley grain is made ready for brewing. Malting is broken down into three steps in order to help to release the starches in the barley. First, during steeping, the grain is added to a vat with water and allowed to soak for approximately 40 hours. During germination , the grain is spread out on the floor of the germination room for around 5 days. The final part of malting
16490-412: The brewing process. as secondary products of alcoholic fermentation Beers vary in their nutritional content. The ingredients used to make beer, including the yeast , provide a rich source of nutrients; therefore beer may contain nutrients including magnesium , selenium , potassium , phosphorus , biotin , chromium and B vitamins . Beer is sometimes referred to as "liquid bread ", though beer
16660-454: The cask by being either poured from a tap by gravity, or pumped up from a cellar via a beer engine (hand pump). Sometimes a cask breather is used to keep the beer fresh by allowing carbon dioxide to replace oxygen as the beer is drawn off the cask. Until 2018, the Campaign for Real Ale (CAMRA) defined real ale as beer "served without the use of extraneous carbon dioxide ", which would disallow
16830-623: The cask. The act of stillaging and then venting a beer in this manner typically disturbs all the sediment, so it must be left for a suitable period of hours to days to "drop" (clear) again, as well as to fully condition the beer . At this point the beer is ready to sell, either being pulled through a beer line with a hand pump, or simply being "gravity-fed" directly into the glass. Draught beer's environmental impact can be 68% lower than bottled beer due to packaging differences. A life cycle study of one beer brand, including grain production, brewing, bottling, distribution and waste management, shows that
17000-696: The city of Plzeň in the present-day Czech Republic . The modern pale lager is light in colour due to use of coke for kilning, which gives off heat with little smoke. Dark beers are usually brewed from a pale malt or lager malt base with a small proportion of darker malt added to achieve the desired shade. Other colourants—such as caramel—are also widely used to darken beers. Very dark beers, such as stout , use dark or patent malts that have been roasted longer. Some have roasted unmalted barley. Beer ranges from less than 3% alcohol by volume (abv) to around 14% abv, though this strength can be increased to around 20% by re-pitching with champagne yeast, and to 55% ABVby
17170-449: The container from which it is dispensed, and served without the use of extraneous carbon dioxide ". It is applied to both bottle conditioned and cask conditioned beers. As for the types of top-fermented beers, pale ale predominantly uses pale malt. It is one of the world's major beer styles and includes India pale ale (IPA). Mild ale has a predominantly malty palate. It is usually dark, with an abv of 3% to 3.6%. Wheat beer
17340-401: The cooled wort goes into a fermentation tank. A type of yeast is selected and added, or "pitched", to the fermentation tank. When the yeast is added to the wort, the fermenting process begins, where the sugars turn into alcohol, carbon dioxide and other components. When the fermentation is complete the brewer may rack the beer into a new tank, called a conditioning tank. Conditioning of the beer
17510-426: The development of artificial refrigeration and by the 1870s, was spread in those countries that concentrated on brewing pale lager. Chilling beer makes it more refreshing, though below 15.5 °C (60 °F) the chilling starts to reduce taste awareness and reduces it significantly below 10 °C (50 °F). Beer served unchilled—either cool or at room temperature—reveal more of their flavours. Cask Marque ,
17680-402: The development of glass vessels for storing and drinking beer, along with the commercial success of pale lager , which - due to the lagering process in which haze and particles settle to the bottom of the tank and so the beer " drops bright " (clears) - has a natural bright appearance and shine. There are several forms of filters; they may be in the form of sheets or "candles", or they may be
17850-742: The discovery of an uncarved cylinder. The seal impressions show a parallel with Uruk, Susa and other sites in Khuzestan . They were partly decorated with drill holes. Steatite served as raw material for these, sometimes treated with tempering. At level V 38 clay tablets of the "numerical tablets" or "impressed tablets" type from the Uruk V period (c. 3500-3350 BC) were found of which 27 were preserved in one piece. They contained primarily accounts, like those discovered at contemporary Uruk period sites in western Iran, Syria, and Mesopotamia. Traces of wine and beer found in ceramics dated to c. 3100–2900 BC and along with
18020-653: The earliest forms of the drink, are Sahti in Finland, Kvass in Russia and Ukraine , and Bouza in Sudan. 4000 years ago fermented bread was used in Mesopotamia. Food waste activists got inspired by these ancient recipes and use leftover bread to replace a third of the malted barley that would otherwise be used for brewing their craft ale. Beer is measured and assessed by colour, by strength and by bitterness. The strength of modern beer
18190-473: The east, from as far as Afghanistan, and to the Mesopotamian flood plain. For example, lapis-lazuli was brought from Badakhshan in Afghanistan to Mesopotamia. During the 1973 campaign, level V was excavated through a deep cut from the citadel. It was occupied during the period 3200–3000 BC. At the end of level V there was a clear gap in the settlement sequence. There were signs of fire, such as room 22 whose roof
18360-496: The female flower clusters or seed cones of the hop vine Humulus lupulus , which are used as a flavouring and preservative agent in nearly all beer made today. Hops had been used for medicinal and food flavouring purposes since Roman times; by the 7th century in Carolingian monasteries in what is now Germany, beer was being made with hops, though it isn't until the thirteenth century that widespread cultivation of hops for use in beer
18530-680: The findings at Hajji Firuz Tepe , provide evidence of the early production of those beverages in the Zagros Mountains. Some Kura–Araxes culture potsherds also seem to appear in association with wine making. Level IV (3000–2650 BC) represents the "invasion" of the northern Yanik-culture (or "Transcaucasian Early Bronze I culture", also known as Kura–Araxes culture ), well known from Yanik Tepe, Iran, near Lake Urmia . (Nevertheless, some other Kura-Araxes potsherds were found in yet deeper layers going back to late fourth millennium BC.) The only notable architectural remains of this period consist of
18700-401: The finished beer. It is a chamber between the brewing kettle and wort chiller. Hops are added to the chamber, the hot wort from the kettle is run through it, and then immediately cooled in the wort chiller before entering the fermentation chamber. Hopbacks utilizing a sealed chamber facilitate maximum retention of volatile hop aroma compounds that would normally be driven off when the hops contact
18870-707: The freeze-distilling process. The alcohol content of beer varies by local practice or beer style. The pale lagers that most consumers are familiar with fall in the range of 4–6%, with a typical ABVof 5%. The customary strength of British ales is quite low, with many session beers being around 4% abv. In Belgium, some beers, such as table beer are of such low alcohol content (1%–4%) that they are served instead of soft drinks in some schools. The weakest beers are described as 'alcohol-free' , typically containing 0.05% ABV; this compares to low alcohol beers which may contain 1.2% ABV or less, and conventional beers which average 4.4% ABV. The strength of beers has climbed during
19040-407: The grains between spargings. The grain does not act like a filtration medium in a mash filter. After mashing, the beer wort is boiled with hops (and other flavourings if used) in a large tank known as a "copper" or brew kettle – though historically the mash vessel was used and is still in some small breweries. The boiling process is where chemical reactions take place, including sterilization of
19210-517: The grains to extract additional sugars (a process known as sparging ). The wort is moved into a large tank known as a "copper" or kettle where it is boiled with hops and sometimes other ingredients such as herbs or sugars. This stage is where many chemical reactions take place, and where important decisions about the flavour, colour, and aroma of the beer are made. The boiling process serves to terminate enzymatic processes, precipitate proteins, isomerize hop resins , and concentrate and sterilize
19380-408: The heat, do not cling to the surface of copper, so the wort is heated in a consistent manner. The simplest boil kettles are direct-fired, with a burner underneath. These can produce a vigorous and favourable boil, but are also apt to scorch the wort where the flame touches the kettle, causing caramelisation and making cleanup difficult. Most breweries use a steam-fired kettle, which uses steam jackets in
19550-433: The hop addition schedule, and volume of water the brewer expects to evaporate. At the end of the boil, solid particles in the hopped wort are separated out, usually in a vessel called a "whirlpool". Copper is the traditional material for the boiling vessel for two main reasons: firstly because copper transfers heat quickly and evenly; secondly because the bubbles produced during boiling, which could act as an insulator against
19720-401: The hot wort. While a hopback has a similar filtering effect as a whirlpool, it operates differently: a whirlpool uses centrifugal forces, a hopback uses a layer of whole hops to act as a filter bed. Furthermore, while a whirlpool is useful only for the removal of pelleted hops (as flowers do not tend to separate as easily), in general hopbacks are used only for the removal of whole flower hops (as
19890-417: The kettle to boil the wort. Breweries usually have a boiling unit either inside or outside of the kettle, usually a tall, thin cylinder with vertical tubes, called a calandria, through which wort is pumped. At the end of the boil, solid particles in the hopped wort are separated out, usually in a vessel called a "whirlpool" or "settling tank". The whirlpool was devised by Henry Ranulph Hudston while working for
20060-418: The largest brewery. In 2007, SABMiller surpassed InBev and Anheuser-Busch when it acquired Royal Grolsch , the brewer of Dutch brand Grolsch. In 2008, when InBev (the second-largest) bought Anheuser-Busch (the third-largest), the new Anheuser-Busch InBev company became again the largest brewer in the world. As of 2020 , according to the market research firm Technavio, AB InBev was the largest brewing company in
20230-521: The later years of the 20th century. Vetter 33, a 10.5% ABV (33 degrees Plato , hence Vetter "33") doppelbock , was listed in the 1994 Guinness Book of World Records as the strongest beer at that time, though Samichlaus , by the Swiss brewer Hürlimann, had also been listed by the Guinness Book of World Records as the strongest at 14% |BV. Since then, some brewers have used champagne yeasts to increase
20400-448: The modern era; after the widespread application of brewing mycology it was discovered that the two separate collecting methods involved two different yeast species that favoured different temperature regimes, namely Saccharomyces cerevisiae in top-cropping at warmer temperatures and Saccharomyces pastorianus in bottom-cropping at cooler temperatures. As brewing methods changed in the 20th century, cylindro-conical fermenting vessels became
20570-399: The most common a plate-style. Water or glycol run in channels in the opposite direction of the wort, causing a rapid drop in temperature. It is very important to quickly cool the wort to a level where yeast can be added safely as yeast is unable to grow in very high temperatures, and will start to die in temperatures above 60 °C (140 °F). After the wort goes through the heat exchanger,
20740-730: The natural production of esters and other byproducts, resulting in a "cleaner"-tasting beer. With improved modern yeast strains, most lager breweries use only short periods of cold storage, typically no more than 2 weeks. Some traditional lagers are still stored for several months. Lambic , a beer of Belgium , is naturally fermented using wild yeasts, rather than cultivated. Many of these are not strains of brewer's yeast ( Saccharomyces cerevisiae ) and may have significant differences in aroma and sourness. Yeast varieties such as Brettanomyces bruxellensis and Brettanomyces lambicus are common in lambics. In addition, other organisms such as Lactobacillus bacteria produce acids which contribute to
20910-460: The nineteenth century the brewing industry has been part of most western economies. The basic ingredients of beer are water and a fermentable starch source such as malted barley . Most beer is fermented with a brewer's yeast and flavoured with hops . Less widely used starch sources include millet , sorghum and cassava . Secondary sources ( adjuncts ), such as maize (corn), rice, or sugar, may also be used, sometimes to reduce cost, or to add
21080-507: The norm and the collection of yeast for both Saccharomyces species is done from the bottom of the fermenter. Thus the method of collection no longer implies a species association. There are a few remaining breweries who collect yeast in the top-cropping method, such as Samuel Smiths brewery in Yorkshire, Marstons in Staffordshire and several German hefeweizen producers. For both types, yeast
21250-530: The oldest evidence of beer is believed to be a 6,000-year-old Sumerian tablet depicting people drinking a beverage through reed straws from a communal bowl . A 3900-year-old Sumerian poem honouring Ninkasi, the patron goddess of brewing, contains the oldest surviving beer recipe, describing the production of beer from barley via bread. The invention of bread and beer has been argued to be responsible for humanity's ability to develop technology and build civilization. The earliest chemically confirmed barley beer to date
21420-441: The particles left by pellets tend to make it through the hopback). The hopback has mainly been substituted in modern breweries by the whirlpool. After the whirlpool, the wort must be brought down to fermentation temperatures 20–26 °C (68–79 °F) before yeast is added. In modern breweries this is achieved through a plate heat exchanger . A plate heat exchanger has sereral ridged plates, which form two separate paths. The wort
21590-407: The perception of the beer and can define and accent the character of the style. Breweries offer branded glassware intended only for their own beers as a marketing promotion, as this increases sales of their product. The pouring process has an influence on a beer's presentation. The rate of flow from the tap or other serving vessel, tilt of the glass, and position of the pour (in the centre or down
21760-464: The previous coarse wares, but the excised designs are less common. Level III (c. 2600–1500/1400 BC) shows connections with Susa and most of Luristan , and it has been suggested that it belonged to the Elamite confederacy. A pottery link to Lagash has been established which may affect the chronology of this layer. Near 1400 BC, Godin Tepe was abandoned and was not re-occupied until c. 750 BC. Level II
21930-453: The process, and greater knowledge of the results. Today, the brewing industry is a global business, consisting of several dominant multinational companies and many thousands of smaller producers ranging from brewpubs to regional breweries . More than 133 billion litres (35 billion gallons) are sold per year—producing total global revenues of $ 294.5 billion (£147.7 billion) in 2006. The basic ingredients of beer are water;
22100-483: The process. In the modern mashing process, commercial fungal based β-glucanase may be added as a supplement. Finally, a mash rest temperature of 65–71 °C (149–160 °F) is used to convert the starches in the malt to sugar, which is then usable by the yeast later in the brewing process. Doing the latter rest at the lower end of the range favours β-amylase enzymes, producing more low-order sugars like maltotriose , maltose , and glucose which are more fermentable by
22270-441: The proportion between different countries. In Sweden in 2001, 63.9% of beer was sold in cans. People either drink from the can or pour the beer into a glass. A technology developed by Crown Holdings for the 2010 FIFA World Cup is the 'full aperture' can, so named because the entire lid is removed during the opening process, turning the can into a drinking cup. Cans protect the beer from light (thereby preventing spoilage) and have
22440-875: The range of flavours in a beer but cooler temperatures are more refreshing. Most drinkers prefer pale lager to be served chilled, a low- or medium-strength pale ale to be served cool, while a strong barley wine or imperial stout to be served at room temperature. Beer writer Michael Jackson proposed a five-level scale for serving temperatures: well chilled (7 °C or 45 °F) for "light" beers (pale lagers); chilled (8 °C or 46 °F) for Berliner Weisse and other wheat beers; lightly chilled (9 °C or 48 °F) for all dark lagers, altbier and German wheat beers; cellar temperature (13 °C or 55 °F) for regular British ale , stout and most Belgian specialities ; and room temperature (15.5 °C or 60 °F) for strong dark ales (especially trappist beer ) and barley wine . Drinking chilled beer began with
22610-480: The result is often a beer with slightly "fruity" compounds resembling apple, pear, pineapple, banana , plum, or prune, among others. After the introduction of hops into England from Flanders in the 15th century, "ale" came to mean an unhopped fermented brew, while "beer" meant a brew with an infusion of hops. The term ' real ale ' was coined by the Campaign for Real Ale (CAMRA) in 1973 for "beer brewed from traditional ingredients, matured by secondary fermentation in
22780-625: The role of yeast in fermentation was understood, fermentation involved wild or airborne yeasts, and a few styles such as lambics still use this method today. Emil Christian Hansen , a Danish biochemist employed by the Carlsberg Laboratory , developed pure yeast cultures which were introduced into the Carlsberg brewery in 1883, and pure yeast strains are now the main fermenting source used worldwide. Some brewers add one or more clarifying agents to beer, which typically precipitate (collect as
22950-435: The role of yeast in fermentation was understood, fermentation involved wild or airborne yeasts. A few styles, such as lambics , rely on this method today, but most modern fermentation adds pure yeast cultures . Some brewers add clarifying agents or finings to beer, which typically precipitate (collect as a solid) out along with protein solids, and are found only in trace amounts in the finished product. This process makes
23120-708: The same grain. Darker malts produce darker beers. Nearly all beers use barley malt for most of the starch, as its fibrous hull remains attached to the grain during threshing. After malting, barley is milled, which finally removes the hull, breaking it into large pieces. These pieces remain with the grain during the mash and act as a filter bed during lautering , when sweet wort is separated from insoluble grain material. Other grains, including wheat, rice, oats , and rye , and less frequently, corn and sorghum may be used. Some brewers have produced gluten-free beer , made with sorghum, for those who cannot consume gluten -containing grains like wheat, barley, and rye. Flavouring beer
23290-581: The seaweed kappaphycus ; polyclar (a commercial brand of clarifier); and gelatin . If a beer is marked "suitable for Vegans", it was generally clarified either with seaweed or with artificial agents, although the "Fast Cask" method invented by Marston's in 2009 may provide another method. There are several steps in the brewing process, which may include malting, mashing, lautering, boiling , fermenting , conditioning , filtering , and packaging . The brewing equipment needed to make beer has grown more sophisticated over time, and now covers most aspects of
23460-416: The side) into the glass all influence the result, such as the size and longevity of the head, lacing (the pattern left by the head as it moves down the glass as the beer is drunk), and the release of carbonation . A beer tower or portable beer tap is sometimes used in bars and restaurants to allow a group of customers to serve themselves. The device consists of a tall container with a cooling mechanism and
23630-600: The site of Godin Tepe in the Zagros Mountains of western Iran . Beer is recorded in the written history of ancient Egypt , and archaeologists speculate that beer was instrumental in the formation of civilizations. Approximately 5000 years ago, workers in the city of Uruk (modern day Iraq) were paid by their employers with volumes of beer. During the building of the Great Pyramids in Giza, Egypt , each worker got
23800-560: The sourness. Around the world, many traditional and ancient starch-based drinks are classed as beer. In Africa, there are ethnic beers made from sorghum or millet , such as Oshikundu in Namibia and Tella in Ethiopia. Kyrgyzstan also has a beer made from millet; it is a low alcohol, somewhat porridge-like drink called "Bozo". Bhutan , Nepal, Tibet and Sikkim also use millet in Chhaang ,
23970-462: The starches released during the malting stage into sugars that can be fermented. The milled grain is mixed with hot water in a large vessel known as a mash tun . In this vessel, the grain and water are mixed together to create a cereal mash. During the mash, naturally occurring enzymes present in the malt convert the starches (long chain carbohydrates) in the grain into smaller molecules or simple sugars (mono-, di-, and tri-saccharides). This "conversion"
24140-428: The steam created during the boil is passed over a coil through which unheated water flows. By adjusting the rate of flow, the output temperature of the water can be controlled. This is also often done using a plate heat exchanger. The water is then stored for later use in the next mash, in equipment cleaning, or wherever necessary. Another common method of energy recovery takes place during the wort cooling. When cold water
24310-503: The strongest beer by a Dutch brewery in July 2010. Draught (also spelled "draft") beer from a pressurised keg using a lever-style dispenser and a spout is the most common method of dispensing in bars around the world. A metal keg is pressurised with carbon dioxide (CO 2 ) gas which drives the beer to the dispensing tap or faucet. Some beers may be served with a nitrogen/carbon dioxide mixture. Nitrogen produces fine bubbles, resulting in
24480-411: The strongest beer made is Schorschbräu's 2011 Schorschbock 57 with 57,5% ABV. It was preceded by The End of History , a 55% Belgian ale , made by BrewDog in 2010. The same company had previously made Sink The Bismarck! , a 41% ABV IPA , and Tactical Nuclear Penguin , a 32% ABV Imperial stout . Each of these beers are made using the eisbock method of fractional freezing , in which a strong ale
24650-513: The strongest variety of porter , a dark brown beer popular with the street and river porters of eighteenth century London. Lager is cool-fermented beer. Pale lagers are the most commonly drunk beers in the world. Many are of the " pilsner " type. The name "lager" comes from the German "lagern" for "to store", as brewers in Bavaria stored beer in cool cellars during the warm summer months, allowing
24820-464: The supply of pure cultured yeast to brewers across Europe. This yeast strain was originally classified as Saccharomyces carlsbergensis , a now defunct species name which has been superseded by the currently accepted taxonomic classification Saccharomyces pastorianus . Lambic beers are historically brewed in Brussels and the nearby Pajottenland region of Belgium without any yeast inoculation. The wort
24990-491: The sweetness of the malt; the bitterness of beers is measured on the International Bitterness Units scale . Hops further contribute floral, citrus, and herbal aromas and flavours. They have an antibiotic effect that favours the activity of brewer's yeast over less desirable microorganisms, and aids in " head retention", the length of time that a foamy head created by carbonation will last. The acidity of hops
25160-669: The three main theories are that the word originates in Proto-Germanic * beuzą (putatively from Proto-Indo-European * bʰeusóm ), meaning ' brewer's yeast , beer dregs'; that it is related to the word barley , or that it was somehow borrowed from Latin bibere 'to drink'. Christine Fell , in Leeds Studies in English (1975), suggests that the Old English/Norse word bēor did not originally denote ale or beer, but
25330-608: The time of Godin VIII, the LC 1, a real increase in the movement of these goods is evident across the region. For example, lapis lazuli , a semi-precious blue stone known to occur naturally only in the Badakshan area of northeastern Afghanistan, began to appear in LC1 sites in significant amounts (Herman 1968)." Thus, the importance of Godin Tepe may have been due to its position serving the early trade from
25500-529: The transition from the Neolithic to Chalcolithic was studied primarily at Seh Gabi. The earliest pottery found was of the painted pottery traditions, including J ware (Godin pre-XI) related to Halaf culture pottery. The impressed Dalma ware ( Dalma Tepe ) (Godin XI/X) is very similar to the pottery traditions from the highlands north of Godin, especially from the area of Lake Urmia . Nadali Beig (Nad Ali Beig)
25670-625: The use of a cask breather, a policy which was reversed in April 2018 to allow beer served with the use of cask breathers to meet its definition of real ale. Barrel-ageing ( US: Barrel aging) is the process of ageing beer in wooden barrels to achieve a variety of effects in the final product. Sour beers such as lambics are fully fermented in wood, while other beers are aged in barrels which were previously used for maturing wines or spirits . In 2016 "Craft Beer and Brewing" wrote: "Barrel-aged beers are so trendy that nearly every taphouse and beer store has
25840-400: The vessels make the risk of infection greater, but with proper cleaning procedures and careful protocol about who enters fermentation chambers, the risk can be well controlled. Fermentation tanks are typically made of stainless steel. If they are simple cylindrical tanks with beveled ends, they are arranged vertically, as opposed to conditioning tanks which are usually laid out horizontally. Only
26010-468: The world, with Heineken second, CR Snow third, Carlsberg fourth, and Molson Coors fifth. A microbrewery , or craft brewery , produces a limited amount of beer. The maximum amount of beer a brewery can produce and still be classed as a 'microbrewery' varies by region and by authority; in the US, it is 15,000 US beer barrels (1.8 megalitres; 390 thousand imperial gallons; 460 thousand US gallons)
26180-400: The wort is cooled and aerated – usually with sterile air – yeast is added to it, and it begins to ferment. It is during this stage that sugars won from the malt are converted into alcohol and carbon dioxide , and the product can be called beer for the first time. Most breweries today use cylindroconical vessels, or CCVs, which have a conical bottom and a cylindrical top. The cone's angle
26350-492: The wort to remove unwanted bacteria, releasing of hop flavours, bitterness and aroma compounds through isomerization , stopping of enzymatic processes, precipitation of proteins, and concentration of the wort. Finally, the vapours produced during the boil volatilise off-flavours , including dimethyl sulfide precursors. The boil is conducted so that it is even and intense – a continuous "rolling boil". The boil on average lasts between 45 and 90 minutes, depending on its intensity,
26520-444: The wort. Hops add flavour, aroma and bitterness to the beer. At the end of the boil, the hopped wort settles to clarify in a vessel called a "whirlpool", where the more solid particles in the wort are separated out. After the whirlpool, the wort is drawn away from the compacted hop trub, and rapidly cooled via a heat exchanger to a temperature where yeast can be added. A variety of heat exchanger designs are used in breweries, with
26690-417: The yeast used by Brasserie Dupont for saison ferments even higher at 29 to 35 °C (84 to 95 °F). They generally form a foam on the surface of the fermenting beer, which is called barm , as during the fermentation process its hydrophobic surface causes the flocs to adhere to CO 2 and rise; because of this, they are often referred to as "top-cropping" or "top-fermenting" – though this distinction
26860-425: The yeast. The process of storing, or conditioning, or maturing, or aging a beer at a low temperature for a long period is called "lagering", and while it is associated with lagers, the process may also be done with ales, with the same result – that of cleaning up various chemicals, acids and compounds. During secondary fermentation, most of the remaining yeast will settle to the bottom of the second fermenter, yielding
27030-413: The yeasts classed as top-fermenting are generally used in warm fermentations, where they ferment quickly, and the yeasts classed as bottom-fermenting are used in cooler fermentations where they ferment more slowly. Yeast were termed top or bottom cropping, because the yeast was collected from the top or bottom of the fermenting wort to be reused for the next brew. This terminology is somewhat inappropriate in
27200-502: Was again abandoned during the 6th century BC, perhaps as a result or in anticipation of the expansion of Cyrus the Great (c. 550 BC) (Brown 1990) or due to the interruption of a social stratification and secondary State formation process after the fall of Assyria . A late, Islamic shrine (c. 15th century). Discovered in 1961, the site was excavated from 1965 to 1973 by a Canadian expedition headed by T. Cuyler Young Jr. and sponsored by
27370-417: Was burned. The houses were in general well-preserved and contained many artefacts, but objects made of the precious metal were lacking. The archaeological evidence support the idea the settlement was abandoned quickly, but in an orderly manner. Just prior to that, in the final phases of Level VI a large architectural feature dubbed the "Oval Enclosure" was uncovered. The pottery of level V show influences from
27540-415: Was classified as Common Ware. The fabric of this group was tempered by medium-fine grit and was not well-fired. This group of pottery has the same colour range like the coarse ware. The surfaces are highly burnished though the vessels with a light interior and dark exterior are predominant. The forms consist entirely of cups, including the recessed neck types. The decoration is similar in style and technique to
27710-550: Was different from every brewer. What they did not contain was hops , as that was a later addition, first mentioned in Europe around 822 by a Carolingian Abbot and again in 1067 by abbess Hildegard of Bingen . In 1516, William IV, Duke of Bavaria adopted the Reinheitsgebot (purity law), perhaps the oldest food-quality regulation still in use in the 21st century, according to which the only allowed ingredients of beer are water, hops , and barley- malt . Beer produced before
27880-465: Was discovered at Godin Tepe in the central Zagros Mountains of Iran, where fragments of a jug, at least 5,000 years old was found to be coated with beerstone , a by-product of the brewing process. Beer may have been known in Neolithic Europe as far back as 5,000 years ago, and was mainly brewed on a domestic scale. Ale produced before the Industrial Revolution continued to be made and sold on
28050-553: Was flavoured with other plants such as grains of paradise or alehoof . Combinations of aromatic herbs, berries, and even wormwood were combined into aflavouring mixture known as gruit . Some beers today, such as Fraoch' by the Scottish Heather Ales company use plants other than hops for flavouring. and Cervoise Lancelot by the French Brasserie-Lancelot company, Hops contribute a bitterness that balances
28220-559: Was known as ale, while beer flavoured with hops was known as beer. Some beers today, such as Fraoch by the Scottish Heather Ales company and Cervoise Lancelot by the French Brasserie-Lancelot company, use plants other than hops for flavouring. Hops contain several characteristics that brewers desire in beer: they contribute a bitterness that balances the sweetness of the malt; they provide floral, citrus, and herbal aromas and flavours; they have an antibiotic effect that favours
28390-430: Was mainly brewed on a domestic scale. The product that the early Europeans drank might not be recognised as beer by most people today. Alongside the basic starch source, the early European beers may have contained fruits, honey, numerous types of plants, spices, and other substances such as narcotic herbs. This mixture was called gruit, where if some were improperly heated could cause hallucinations. The mixture of gruit
28560-583: Was not used to saccharify the rice (amylolytic fermentation); the rice was probably prepared for fermentation by chewing or malting . During the Vedic period in Ancient India , there are records of the consumption of the beer-like sura . Xenophon noted that during his travels, beer was being produced in Armenia . Beer was spread through Europe by Germanic and Celtic tribes as far back as 3000 BC, and it
28730-697: Was sent from the Spaten brewery in Munich to the Carlsberg brewery in Copenhagen in 1845 who began brewing with it. In 1883 Emile Hansen completed a study on pure yeast culture isolation and the pure strain obtained from Spaten went into industrial production in 1884 as Carlsberg yeast No 1. Another specialized pure yeast production plant was installed at the Heineken Brewery in Rotterdam the following year and together they began
28900-459: Was used for producing bowls entirely. Conical bowls decorated with incised and excised designs are common; the incised designs are occasionally filled with a whitish paste. The second type of coarse ware is lighter in colour, often tan or pinkish buff. The surface of the vessels is either burnished or plain. Besides bowls there are jars with protruding rims and concave or recessed necks. The second group of Transcaucasian Pottery found at Godin Tepe
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