97-660: Asbestos Corporation Limited (ACL) is a Canadian corporation originally established to mine asbestos . ACL mainly open pit mined chrysotile asbestos in Thetford Mines, Quebec. It is no longer involved in asbestos mining, but as a subsidiary of Mazarin Inc it continues to exist to exploit the minerals contained in its tailings in Thetford Mines as well as restoring and developing its land holdings. The company faces multiple ongoing lawsuits regarding its former asbestos operations. This article about an industrial corporation or company
194-406: A catalyst , a substance that is not consumed, when added, in any chemical reaction during combustion, but which enables the reactants to combust more readily. Once ignited, a chain reaction must take place whereby fires can sustain their own heat by the further release of heat energy in the process of combustion and may propagate, provided there is a continuous supply of an oxidizer and fuel. If
291-403: A high energy fuel for jet and rocket engines , emits intense green flame, leading to its informal nickname of "Green Dragon". The glow of a flame is complex. Black-body radiation is emitted from soot, gas, and fuel particles, though the soot particles are too small to behave like perfect blackbodies. There is also photon emission by de-excited atoms and molecules in the gases. Much of
388-551: A 13-year timeframe, and that the EPA did not provide adequate evidence for the safety of alternative products. Until the mid-1980s, small amounts of white asbestos were used in the manufacture of Artex , a decorative stipple finish, however, some of the lesser-known suppliers of Artex-type materials were still adding white asbestos until 1999. Before the ban, asbestos was widely used in the construction industry in thousands of materials. Some are judged to be more dangerous than others due to
485-504: A Christian bishop living in 4th-century Egypt, references asbestos in one of his writings. Around the year 318, he wrote as follows: The natural property of fire is to burn. Suppose, then, that there was a substance such as the Indian asbestos is said to be, which had no fear of being burnt, but rather displayed the impotence of the fire by proving itself unburnable. If anyone doubted the truth of this, all he need do would be to wrap himself up in
582-744: A certified asbestos-testing laboratory found the tremolite form of amphibole asbestos used to be found in three out of eight popular brands of children's crayons that were made partly from talc: Crayola , Prang, and RoseArt. In Crayola crayons, the tests found asbestos levels around 0.05% in Carnation Pink and 2.86% in Orchid ; in Prang crayons, the range was from 0.3% in Periwinkle to 0.54% in Yellow ; in Rose Art crayons, it
679-461: A combustible material left after a fire is called clinker if its melting point is below the flame temperature, so that it fuses and then solidifies as it cools, and ash if its melting point is above the flame temperature. Fire is a chemical process in which a fuel and an oxidizing agent react, yielding carbon dioxide and water . This process, known as a combustion reaction , does not proceed directly and involves intermediates . Although
776-482: A controversial gap in the Late Devonian , charcoal is present ever since. The level of atmospheric oxygen is closely related to the prevalence of charcoal: clearly oxygen is the key factor in the abundance of wildfire. Fire also became more abundant when grasses radiated and became the dominant component of many ecosystems, around 6 to 7 million years ago ; this kindling provided tinder which allowed for
873-450: A fire. The most common form of active fire protection is fire sprinklers . To maximize passive fire protection of buildings, building materials and furnishings in most developed countries are tested for fire-resistance , combustibility and flammability . Upholstery , carpeting and plastics used in vehicles and vessels are also tested. Where fire prevention and fire protection have failed to prevent damage, fire insurance can mitigate
970-613: A large number of early deaths and lung problems in asbestos-mining towns. The first such study was conducted by Murray at the Charing Cross Hospital , London , in 1900, in which a postmortem investigation discovered asbestos traces in the lungs of a young man who had died from pulmonary fibrosis after having worked for 14 years in an asbestos textile factory. Adelaide Anderson , the Inspector of Factories in Britain, included asbestos in
1067-609: A list of harmful industrial substances in 1902. Similar investigations were conducted in France in 1906 and Italy in 1908. The first diagnosis of asbestosis was made in the UK in 1924. Nellie Kershaw was employed at Turner Brothers Asbestos in Rochdale , Greater Manchester , England , from 1917, spinning raw asbestos fibre into yarn. Her death in 1924 led to a formal inquest. Pathologist William Edmund Cooke testified that his examination of
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#17328723359011164-716: A long history . Fire was the basis of all early thermal weapons . The Byzantine fleet used Greek fire to attack ships and men. The invention of gunpowder in China led to the fire lance , a flame-thrower weapon dating to around 1000 CE which was a precursor to projectile weapons driven by burning gunpowder . The earliest modern flamethrowers were used by infantry in the First World War , first used by German troops against entrenched French troops near Verdun in February 1915. They were later successfully mounted on armoured vehicles in
1261-550: A materials analyst whose testimony on behalf of the asbestos industry has been accepted in lawsuits over 250 times, found its crayons tested negative for asbestos. In spite of that, in June 2000 Binney & Smith, the maker of Crayola, and the other makers agreed to stop using talc in their products, and changed their product formulations in the United States. The mining company R T Vanderbilt Co of Gouverneur, New York , which supplied
1358-459: A potential health hazard and is no longer used at all. Amphiboles including amosite (brown asbestos) and crocidolite (blue asbestos) were formerly used in many products until the early 1980s. Tremolite asbestos constituted a contaminant of many if not all naturally occurring chrysotile deposits. The use of all types of asbestos in the amphibole group was banned in much of the Western world by
1455-511: A reasonable doubt, the primary cause of the fibrosis of the lungs and therefore of death." As a result of Cooke's paper, Parliament commissioned an inquiry into the effects of asbestos dust by E. R. A. Merewether, Medical Inspector of Factories, and C. W. Price , a factory inspector and pioneer of dust monitoring and control. Their subsequent report, Occurrence of Pulmonary Fibrosis & Other Pulmonary Affections in Asbestos Workers ,
1552-631: A series of mechanisms that behave differently in micro gravity when compared to normal gravity conditions. These discoveries have potential applications in applied science and industry , especially concerning fuel efficiency . The adiabatic flame temperature of a given fuel and oxidizer pair is that at which the gases achieve stable combustion. Fire science is a branch of physical science which includes fire behavior, dynamics, and combustion . Applications of fire science include fire protection , fire investigation , and wildfire management. Every natural ecosystem on land has its own fire regime , and
1649-436: A similar point in time. The use of fire became progressively more sophisticated, as it was used to create charcoal and to control wildlife from tens of thousands of years ago. Fire has also been used for centuries as a method of torture and execution, as evidenced by death by burning as well as torture devices such as the iron boot , which could be filled with water, oil , or even lead and then heated over an open fire to
1746-505: Is a stub . You can help Misplaced Pages by expanding it . Asbestos Asbestos ( / æ s ˈ b ɛ s t ə s , æ z -, - t ɒ s / ass- BES -təs, az-, -toss ) is a group of naturally occurring, toxic , carcinogenic and fibrous silicate minerals . There are six types, all of which are composed of long and thin fibrous crystals , each fibre ( particulate with length substantially greater than width) being composed of many microscopic "fibrils" that can be released into
1843-403: Is corrugated asbestos-cement sheets or "A/C sheets" for roofing and sidewalls. Millions of homes, factories, schools or sheds, and shelters continue to use asbestos. Cutting these sheets to size and drilling holes to receive 'J' bolts to help secure the sheets to roof framing is done on-site. There has been no significant change in production and use of A/C sheets in developing countries following
1940-537: Is feeding the fire. Fire prevention is intended to reduce sources of ignition. Fire prevention also includes education to teach people how to avoid causing fires. Buildings, especially schools and tall buildings, often conduct fire drills to inform and prepare citizens on how to react to a building fire. Purposely starting destructive fires constitutes arson and is a crime in most jurisdictions. Model building codes require passive fire protection and active fire protection systems to minimize damage resulting from
2037-417: Is its use to clear land for agriculture. Slash-and-burn agriculture is still common across much of tropical Africa, Asia and South America. For small farmers, controlled fires are a convenient way to clear overgrown areas and release nutrients from standing vegetation back into the soil. However, this useful strategy is also problematic. Growing population, fragmentation of forests and warming climate are making
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#17328723359012134-486: Is not a material covered under CERCLA 's innocent purchaser defense. In the UK, the removal and disposal of asbestos and substances containing it are covered by the Control of Asbestos Regulations 2006 . U.S. asbestos consumption hit a peak of 804,000 tons in 1973; world asbestos demand peaked around 1977, with 25 countries producing nearly 4.8 million metric tons annually. In older buildings (e.g. those built before 1999 in
2231-404: Is one of the four classical elements and has been used by humans in rituals , in agriculture for clearing land, for cooking, generating heat and light, for signaling, propulsion purposes, smelting , forging , incineration of waste, cremation , and as a weapon or mode of destruction. The word "fire" originated from Old English Fyr 'Fire, a fire', which can be traced back to
2328-405: Is the rapid oxidation of a material (the fuel ) in the exothermic chemical process of combustion , releasing heat , light , and various reaction products . At a certain point in the combustion reaction, called the ignition point, flames are produced. The flame is the visible portion of the fire. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. If hot enough,
2425-417: Is used by nearly every human being on Earth in a controlled setting every day. Users of internal combustion vehicles employ fire every time they drive. Thermal power stations provide electricity for a large percentage of humanity by igniting fuels such as coal , oil or natural gas , then using the resultant heat to boil water into steam , which then drives turbines . The use of fire in warfare has
2522-581: The Germanic root * fūr- , which itself comes from the Proto-Indo-European * perjos from the root * paewr- ' fire ' . The current spelling of "fire" has been in use since as early as 1200, but it was not until around 1600 that it completely replaced the Middle English term fier (which is still preserved in the word "fiery"). The fossil record of fire first appears with
2619-483: The Hindu Kush . According to Biruni in his book Gems , any cloths made of asbestos ( Persian : آذرشست , āzarshost ) were called shostakeh ( Persian : شستكه ). Some Persians believed the fiber was the fur of an animal called the samandar ( Persian : سمندر ), which lived in fire and died when exposed to water; this was where the former belief originated that the salamander could tolerate fire. Charlemagne ,
2716-897: The Urals of the Russian Empire in the 1880s, and the Alpine regions of Northern Italy with the formation in Turin of the Italo-English Pure Asbestos Company in 1876, although this was soon swamped by the greater production levels from the Canadian mines. Mining also took off in South Africa from 1893 under the aegis of the British businessman Francis Oates, the director of the De Beers company. It
2813-408: The flash point for the fuel /oxidizer mix, and is able to sustain a rate of rapid oxidation that produces a chain reaction . This is commonly called the fire tetrahedron . Fire cannot exist without all of these elements in place and in the right proportions. For example, a flammable liquid will start burning only if the fuel and oxygen are in the right proportions. Some fuel-oxygen mixes may require
2910-597: The 1600s, ultimately derives from the Ancient Greek : ἄσβεστος , meaning "unquenchable" or "inextinguishable". The name reflects use of the substance for wicks that would never burn up. It was adopted into English via the Old French abestos , which got the word from Greek via Latin , but in the original Greek, "asbestos" actually referred to quicklime . It is said by the Oxford English Dictionary that
3007-642: The 1850s but were unsuccessful in creating a market for such products. Canadian samples of asbestos were displayed in London in 1862, and the first companies were formed in England and Scotland to exploit this resource. Asbestos was first used in the manufacture of yarn, and German industrialist Louis Wertheim adopted this process in his factories in Germany. In 1871, the Patent Asbestos Manufacturing Company
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3104-610: The 1950s that talc products could be contaminated with asbestos. In 2020, laboratory tests of 21 talc-based cosmetics products found that 15 percent were contaminated with asbestos. In July 2024, the World Health Organization (WHO) heightened its health warning about talc exposure. In a study published in The Lancet, the WHO changed its classification of talc from "possibly carcinogenic" to "probably carcinogenic." In 2000, tests in
3201-464: The 1970s. Many buildings constructed before the 1980s contain asbestos. The use of asbestos for construction and fireproofing has been made illegal in many countries. Despite this, around 255,000 people are thought to die each year from diseases related to asbestos exposure. In part, this is because many older buildings still contain asbestos; in addition, the consequences of exposure can take decades to arise. The latency period (from exposure until
3298-528: The Chief Inspector of Factories and Workshops in the United Kingdom noted the negative health effects of asbestos, the contribution having been made by Lucy Deane Streatfeild , one of the first women factory inspectors . In 1899, H. Montague Murray noted the negative health effects of asbestos. The first documented death related to asbestos was in 1906. In the early 1900s, researchers began to notice
3395-456: The European Union, the United Kingdom, Australia, Hong Kong, Japan, and New Zealand. A notable exception is the United States, where asbestos continues to be used in construction such as cement asbestos pipes. The 5th Circuit Court prevented the EPA from banning asbestos in 1991 because EPA research showed the ban would cost between US$ 450 and 800 million while only saving around 200 lives in
3492-461: The Libby mine was used as insulation in residential and commercial buildings through Canada and the United States. W. R. Grace and Company's loose-fill vermiculite was marketed as Zonolite but was also used in sprayed-on products such as Monokote . In 1999, the EPA began cleanup efforts in Libby and now the area is a Superfund cleanup area. The EPA has determined that harmful asbestos is released from
3589-567: The Second World War, notably on Coventry , Tokyo , Rotterdam , London , Hamburg and Dresden ; in the latter two cases firestorms were deliberately caused in which a ring of fire surrounding each city was drawn inward by an updraft caused by a central cluster of fires. The United States Army Air Force also extensively used incendiaries against Japanese targets in the latter months of the war, devastating entire cities constructed primarily of wood and paper houses. The incendiary fluid napalm
3686-496: The Second World War. Hand-thrown incendiary bombs improvised from glass bottles, later known as Molotov cocktails , were deployed during the Spanish Civil War in the 1930s. Also during that war, incendiary bombs were deployed against Guernica by Fascist Italian and Nazi German air forces that had been created specifically to support Franco's Nationalists . Incendiary bombs were dropped by Axis and Allies during
3783-497: The UK, before white asbestos was banned), asbestos may still be present in some areas. Being aware of asbestos locations reduces the risk of disturbing asbestos. Removal of asbestos building components can also remove the fire protection they provide, therefore fire protection substitutes are required for proper fire protection that the asbestos originally provided. Some countries, such as India , Indonesia, China and Russia, have continued widespread use of asbestos. The most common
3880-589: The UK, the Health and Safety Executive have issued guidance called HSG264 describing how surveys should be completed although other methods can be used if they can demonstrate they have met the regulations by other means. The EPA includes some, but not all, asbestos-contaminated facilities on the Superfund National Priorities List (NPL). Renovation and demolition of asbestos-contaminated buildings are subject to EPA NESHAP and OSHA Regulations. Asbestos
3977-454: The abbreviation ND (non-detect) in the laboratory report – indicates no asbestos fibers actually were found in the samples." Multiple studies by mineral chemists, cell biologists, and toxicologists between 1970 and 2000 found neither samples of asbestos in talc products nor symptoms of asbestos exposure among workers dealing with talc, but more recent work has rejected these conclusions in favor of "same as" asbestos risk. Fire Fire
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4074-467: The agony of the wearer. By the Neolithic Revolution , during the introduction of grain-based agriculture, people all over the world used fire as a tool in landscape management. These fires were typically controlled burns or "cool fires", as opposed to uncontrolled "hot fires", which damage the soil. Hot fires destroy plants and animals, and endanger communities. This is especially a problem in
4171-539: The air following the buildings' destruction. Inhalation of a mixture of asbestos and other toxicants is thought to be linked to the unusually high death rate from cancer of emergency service workers since the disaster. Thousands more are now thought to be at risk of developing cancer due to this exposure with those who have died so far being only the "tip of the iceberg". In May 2002, after numerous cleanup, dust collection, and air monitoring activities were conducted outdoors by EPA, other federal agencies, New York City, and
4268-409: The amount of asbestos and the material's friable nature. Sprayed coatings, pipe insulation, and Asbestos Insulating Board (AIB) are thought to be the most dangerous due to their high content of asbestos and friable nature. Many older buildings built before the late 1990s contain asbestos. In the United States, there is a minimum standard for asbestos surveys as described by ASTM standard E 2356–18. In
4365-501: The atmosphere by abrasion and other processes. Inhalation of asbestos fibres can lead to various dangerous lung conditions, including mesothelioma , asbestosis , and lung cancer . As a result of these health effects, asbestos is considered a serious health and safety hazard . Archaeological studies have found evidence of asbestos being used as far back as the Stone Age to strengthen ceramic pots, but large-scale mining began at
4462-488: The bodies of their kings to preserve only their ashes and to prevent the ashes being mixed with those of wood or other combustible materials commonly used in funeral pyres . Others assert that these peoples used asbestos to make perpetual wicks for sepulchral or other lamps. A famous example is the golden lamp asbestos lychnis , which the sculptor Callimachus made for the Erechtheion . In more recent centuries, asbestos
4559-491: The burning of vegetation releases nitrogen into the atmosphere, unlike elements such as potassium and phosphorus which remain in the ash and are quickly recycled into the soil. This loss of nitrogen caused by a fire produces a long-term reduction in the fertility of the soil, which can be recovered as atmospheric nitrogen is fixed and converted to ammonia by natural phenomena such as lightning or by leguminous plants such as clover , peas , and green beans . Fire
4656-546: The detrimental effects of asbestos on human beings, examination of the primary sources reveals no support for either claim. In China, accounts of obtaining huo huan bu ( 火浣布 ) or "fire-laundered cloth" certainly dates to the Wei dynasty, and there are claims they were known as early as in the Zhou dynasty , though not substantiated except in writings thought to date much later (see huoshu or "fire rat"). Athanasius of Alexandria ,
4753-493: The diagnosis of negative health effects) is typically 20 years. The most common diseases associated with chronic asbestos exposure are asbestosis (scarring of the lungs due to asbestos inhalation) and mesothelioma (a type of cancer). Many developing countries still support the use of asbestos as a building material , and mining of asbestos is ongoing, with the top producer, Russia , having an estimated production of 790,000 tonnes in 2020. The word "asbestos", first used in
4850-440: The early 15th century, but this usage was superseded by "asbestos". The word is pronounced / æ s ˈ b ɛ s t ə s / or / æ s ˈ b ɛ s t ɒ s / . Asbestos has been used for thousands of years to create flexible objects that resist fire, including napkins, but, in the modern era, companies began producing consumer goods containing asbestos on an industrial scale. Today, the risk of asbestos has been recognized;
4947-477: The earth's surface more prone to ever-larger escaped fires. These harm ecosystems and human infrastructure, cause health problems, and send up spirals of carbon and soot that may encourage even more warming of the atmosphere – and thus feed back into more fires. Globally today, as much as 5 million square kilometres – an area more than half the size of the United States – burns in a given year. There are numerous modern applications of fire. In its broadest sense, fire
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#17328723359015044-488: The end of the 19th century when its diverse applications included fire-retardant coatings, concrete, bricks, pipes and fireplace cement, heat-, fire-, and acid-resistant gaskets, pipe insulation, ceiling insulation, fireproof drywall, flooring, roofing, lawn furniture, and drywall joint compound. In 2011, it was reported that over 50% of UK houses still contained asbestos, despite a ban on asbestos products some years earlier. In Japan, particularly after World War II , asbestos
5141-453: The end of the 19th century when manufacturers and builders began using asbestos for its desirable physical properties. Asbestos is an excellent thermal and electrical insulator , and is highly fire resistant, so for much of the 20th century, it was very commonly used around the world as a building material (particularly for its fire-retardant properties), until its adverse effects on human health were more widely recognized and acknowledged in
5238-596: The establishment of a land-based flora in the Middle Ordovician period, 470 million years ago , permitting the accumulation of oxygen in the atmosphere as never before, as the new hordes of land plants pumped it out as a waste product. When this concentration rose above 13%, it permitted the possibility of wildfire . Wildfire is first recorded in the Late Silurian fossil record, 420 million years ago , by fossils of charcoalified plants. Apart from
5335-652: The familiar red-orange glow of "fire". This light has a continuous spectrum . Complete combustion of gas has a dim blue color due to the emission of single-wavelength radiation from various electron transitions in the excited molecules formed in the flame. Usually oxygen is involved, but hydrogen burning in chlorine also produces a flame, producing hydrogen chloride (HCl). Other possible combinations producing flames, amongst many, are fluorine and hydrogen , and hydrazine and nitrogen tetroxide . Hydrogen and hydrazine/ UDMH flames are similarly pale blue, while burning boron and its compounds, evaluated in mid-20th century as
5432-407: The fire. Because of this, the risk of fire in a spacecraft is small when it is coasting in inertial flight. This does not apply if oxygen is supplied to the fire by some process other than thermal convection. Fire can be extinguished by removing any one of the elements of the fire tetrahedron. Consider a natural gas flame, such as from a stove-top burner. The fire can be extinguished by any of
5529-494: The first Holy Roman Emperor (800–814), is also said to have possessed such a tablecloth. Marco Polo recounts having been shown, in a place he calls Ghinghin talas , "a good vein from which the cloth which we call of salamander, which cannot be burnt if it is thrown into the fire, is made ..." The large-scale asbestos industry began in the mid-19th century. Early attempts at producing asbestos paper and cloth in Italy began in
5626-665: The flame becomes spherical, with a tendency to become more blue and more efficient (although it may go out if not moved steadily, as the CO 2 from combustion does not disperse as readily in microgravity, and tends to smother the flame). There are several possible explanations for this difference, of which the most likely is that the temperature is sufficiently evenly distributed that soot is not formed and complete combustion occurs. Experiments by NASA reveal that diffusion flames in microgravity allow more soot to be completely oxidized after they are produced than diffusion flames on Earth, because of
5723-405: The following: In contrast, fire is intensified by increasing the overall rate of combustion. Methods to do this include balancing the input of fuel and oxidizer to stoichiometric proportions, increasing fuel and oxidizer input in this balanced mix, increasing the ambient temperature so the fire's own heat is better able to sustain combustion, or providing a catalyst, a non-reactant medium in which
5820-595: The food. The heat produced would also help people stay warm in cold weather, enabling them to live in cooler climates. Fire also kept nocturnal predators at bay. Evidence of occasional cooked food is found from 1 million years ago . Although this evidence shows that fire may have been used in a controlled fashion about 1 million years ago, other sources put the date of regular use at 400,000 years ago. Evidence becomes widespread around 50 to 100 thousand years ago, suggesting regular use from this time; resistance to air pollution started to evolve in human populations at
5917-484: The forests of today where traditional burning is prevented in order to encourage the growth of timber crops. Cool fires are generally conducted in the spring and autumn. They clear undergrowth, burning up biomass that could trigger a hot fire should it get too dense. They provide a greater variety of environments, which encourages game and plant diversity. For humans, they make dense, impassable forests traversable. Another human use for fire in regards to landscape management
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#17328723359016014-460: The fuel and oxidizer can more readily react. A flame is a mixture of reacting gases and solids emitting visible, infrared , and sometimes ultraviolet light, the frequency spectrum of which depends on the chemical composition of the burning material and intermediate reaction products. In many cases, such as the burning of organic matter , for example wood, or the incomplete combustion of gas, incandescent solid particles called soot produce
6111-646: The fuel; how to stoke the fire both in early phases and in maintenance phases; how to modulate the heat, flame, and smoke as suited to the desired application; how best to bank a fire to be revived later; how to choose, design, or modify stoves, fireplaces, bakery ovens, or industrial furnaces ; and so on. Detailed expositions of fire management are available in various books about blacksmithing, about skilled camping or military scouting , and about domestic arts . Burning fuel converts chemical energy into heat energy; wood has been used as fuel since prehistory . The International Energy Agency states that nearly 80% of
6208-756: The gases may become ionized to produce plasma . Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity will be different. Fire, in its most common form, has the potential to result in conflagration , which can lead to physical damage, which can be permanent, through burning . Fire is a significant process that influences ecological systems worldwide. The positive effects of fire include stimulating growth and maintaining various ecological systems. Its negative effects include hazard to life and property, atmospheric pollution, and water contamination. When fire removes protective vegetation , heavy rainfall can contribute to increased soil erosion by water . Additionally,
6305-442: The lungs indicated old scarring indicative of a previous, healed tuberculosis infection, and extensive fibrosis , in which were visible "particles of mineral matter ... of various shapes, but the large majority have sharp angles." Having compared these particles with samples of asbestos dust provided by S. A. Henry, His Majesty's Medical Inspector of Factories, Cooke concluded that they "originated from asbestos and were, beyond
6402-479: The mid-1980s, and in Japan by 1995. Some products that included amphibole types of asbestos included the following: Cigarette manufacturer Lorillard ( Kent's filtered cigarette ) used crocidolite asbestos in its "Micronite" filter from 1952 to 1956. While mostly chrysotile asbestos fibers were once used in automobile brake pads , shoes, and clutch discs , contaminants of amphiboles were present. Since approximately
6499-407: The mid-1990s, brake pads, new or replacement, have been manufactured instead with linings made of ceramic, carbon, metallic, and aramid fiber ( Twaron or Kevlar —the same material used in bulletproof vests ). Artificial Christmas snow, known as flocking, was previously made with asbestos. It was used as an effect in films including The Wizard of Oz and department store window displays and it
6596-530: The mine as well as through other activities that disturb soil in the area. Talc can sometimes be contaminated with asbestos due to the proximity of asbestos ore (usually tremolite ) in underground talc deposits. By 1973, US federal law required all talc products to be asbestos-free. Separating cosmetic-grade talc (e.g. talcum powder) from industrial-grade talc (often used in friction products) has largely eliminated this issue for consumers. Cosmetics companies, including Johnson & Johnson, have known since
6693-473: The more rapid spread of fire. These widespread fires may have initiated a positive feedback process, whereby they produced a warmer, drier climate more conducive to fire. The ability to control fire was a dramatic change in the habits of early humans. Making fire to generate heat and light made it possible for people to cook food, simultaneously increasing the variety and availability of nutrients and reducing disease by killing pathogenic microorganisms in
6790-507: The national rate. Thousands of tons of asbestos were used in World War II ships to insulate piping, boilers, steam engines, and steam turbines. There were approximately 4.3 million shipyard workers in the United States during the war; for every 1,000 workers, about 14 died of mesothelioma and an unknown number died of asbestosis. The United States government and the asbestos industry have been criticized for not acting quickly enough to inform
6887-558: The opening of the Quebec Central Railway in 1876, mining entrepreneurs such as Andrew Stuart Johnson established the asbestos industry in the province. The 50-ton output of the mines in 1878 rose to over 10,000 tonnes in the 1890s with the adoption of machine technologies and expanded production. For a long time, the world's largest asbestos mine was the Jeffrey mine in the town of Asbestos, Quebec . Asbestos production began in
6984-435: The organisms in those ecosystems are adapted to or dependent upon that fire regime. Fire creates a mosaic of different habitat patches, each at a different stage of succession . Different species of plants, animals, and microbes specialize in exploiting a particular stage, and by creating these different types of patches, fire allows a greater number of species to exist within a landscape. Wildfire prevention programs around
7081-407: The oxidizer is oxygen from the surrounding air, the presence of a force of gravity , or of some similar force caused by acceleration, is necessary to produce convection , which removes combustion products and brings a supply of oxygen to the fire. Without gravity, a fire rapidly surrounds itself with its own combustion products and non-oxidizing gases from the air, which exclude oxygen and extinguish
7178-421: The oxidizing agent is typically oxygen , other compounds are able to fulfill the role. For instance, chlorine trifluoride is able to ignite sand . Fires start when a flammable or a combustible material, in combination with a sufficient quantity of an oxidizer such as oxygen gas or another oxygen-rich compound (though non-oxygen oxidizers exist), is exposed to a source of heat or ambient temperature above
7275-629: The potential as well, but asbestos may have the greatest potential and is the subject of research now in progress in an emerging field of scientific study to examine it. The most common type of asbestos, chrysotile, chemically reacts with CO 2 to produce ecologically stable magnesium carbonate . Chrysotile , like all types of asbestos, has a large surface area that provides more places for chemical reactions to occur, compared to most other naturally occurring materials. The use of asbestos in new construction projects has been banned for health and safety reasons in many developed countries or regions, including
7372-441: The public of dangers and to reduce public exposure. In the late 1970s, court documents proved that asbestos industry officials knew of asbestos dangers since the 1930s and had concealed them from the public. In Australia, asbestos was widely used in construction and other industries between 1946 and 1980. From the 1970s, there was increasing concern about the dangers of asbestos, and following community and union campaigning, its use
7469-495: The radiation is emitted in the visible and infrared bands. The color depends on temperature for the black-body radiation, and on chemical makeup for the emission spectra . The common distribution of a flame under normal gravity conditions depends on convection , as soot tends to rise to the top of a general flame, as in a candle in normal gravity conditions, making it yellow. In microgravity or zero gravity , such as an environment in outer space , convection no longer occurs, and
7566-444: The serpentine group. In the United States, chrysotile has been the most commonly used type of asbestos. According to the U.S. Environmental Protection Agency (EPA) Asbestos Building Inspectors Manual, chrysotile accounts for approximately 95% of asbestos found in buildings in the United States. Chrysotile is often present in a wide variety of products and materials, including: In the European Union and Australia, it has been banned as
7663-825: The state of New York, New York City formally requested federal assistance to clean and test residences in the vicinity of the World Trade Center site for airborne asbestos. Vermiculite is a hydrated laminar magnesium-aluminum-iron silicate that resembles mica . It can be used for many industrial applications and has been used as insulation. Some deposits of vermiculite are contaminated with small amounts of asbestos. One vermiculite mine operated by W. R. Grace and Company in Libby, Montana exposed workers and community residents to danger by mining vermiculite contaminated with asbestos, typically richterite , winchite, actinolite or tremolite . Vermiculite contaminated with asbestos from
7760-418: The substance in question and then touch the fire." Wealthy Persians amazed guests by cleaning a cloth by exposing it to fire . For example, according to Tabari , one of the curious items belonging to Khosrow II Parviz, the great Sassanian king (r. 590–628), was a napkin ( Persian : منديل ) that he cleaned simply by throwing it into fire. Such cloth is believed to have been made of asbestos imported over
7857-501: The talc to the crayon makers, states that "to the best of our knowledge and belief" there had never been any asbestos-related disease among the company's workers. However media reports claim that the United States Mine Safety and Health Administration (MSHA) had found asbestos in four talc samples tested in 2000. The Assistant Secretary for Mine Safety and Health subsequently wrote to the news reporter, stating that "In fact,
7954-580: The use of asbestos is completely banned in 66 countries and strictly regulated in many others. Asbestos use dates back at least 4,500 years, when the inhabitants of the Lake Juojärvi region in East Finland strengthened earthenware pots and cooking utensils with the asbestos mineral anthophyllite ; archaeologists call this style of pottery " asbestos-ceramic ". Some archaeologists believe that ancient peoples made shrouds of asbestos, wherein they burned
8051-573: The widespread restrictions in developed nations. As New York City 's World Trade Center collapsed following the September 11 attacks , Lower Manhattan was blanketed in a mixture of building debris and combustible materials. This complex mixture gave rise to the concern that thousands of residents and workers in the area would be exposed to known hazards in the air and dust, such as asbestos, lead, glass fibers, and pulverized concrete. More than 1,000 tons of asbestos are thought to have been released into
8148-623: The word was wrongly used by Pliny for what we now call asbestos, and that he popularized the misnomer . Asbestos was originally referred to in Greek as amiantos , meaning "undefiled", because when thrown into a fire it came out unmarked. "Amiantos" is the source for the word for asbestos in many languages, such as the Portuguese amianto and the French amiante . It had also been called "amiant" in English in
8245-505: The word ἀσβεστος or ασβέστης stands consistently and solely for lime . The term asbestos is traceable to Roman naturalist Pliny the Elder 's first-century manuscript Natural History and his use of the term asbestinon , meaning "unquenchable"; he described the mineral as being more expensive than pearls . While Pliny or his nephew Pliny the Younger is popularly credited with recognising
8342-573: The world may employ techniques such as wildland fire use and prescribed or controlled burns . Wildland fire use refers to any fire of natural causes that is monitored but allowed to burn. Controlled burns are fires ignited by government agencies under less dangerous weather conditions. Fire fighting services are provided in most developed areas to extinguish or contain uncontrolled fires. Trained firefighters use fire apparatus , water supply resources such as water mains and fire hydrants or they might use A and B class foam depending on what
8439-462: The world's power has consistently come from fossil fuels such as petroleum , natural gas , and coal in the past decades. The fire in a power station is used to heat water, creating steam that drives turbines . The turbines then spin an electric generator to produce electricity. Fire is also used to provide mechanical work directly by thermal expansion , in both external and internal combustion engines . The unburnable solid remains of
8536-611: Was established in Glasgow , and during the following decades, the Clydebank area became a centre for the nascent industry. Industrial-scale mining began in the Thetford hills , Quebec , from the 1870s. Sir William Edmond Logan was the first to notice the large deposits of chrysotile in the hills in his capacity as head of Geological Survey of Canada . Samples of the minerals from there were displayed in London and elicited much interest. With
8633-459: Was first used in medical literature in 1931; its association with asbestos was first noted sometime in the 1940s. Similar legislation followed in the U.S. about ten years later. Approximately 100,000 people in the United States have died, or are terminally ill, from asbestos exposure related to shipbuilding. In the Hampton Roads area, a shipbuilding center, mesothelioma occurrence is seven times
8730-587: Was from 0.03% in Brown to 1.20% in Orange . Overall, 32 different types of crayons from these brands used to contain more than trace amounts of asbestos, and eight others contained trace amounts. The Art and Creative Materials Institute , a trade association which tested the safety of crayons on behalf of the makers, initially insisted the test results must have been incorrect, although they later said they do not test for asbestos. In May 2000, Crayola said tests by Richard Lee,
8827-707: Was in South Africa that the production of amosite began in 1910. The U.S. asbestos industry had an early start in 1858 when fibrous anthophyllite was mined for use as asbestos insulation by the Johns Company, a predecessor to the current Johns Manville , at a quarry at Ward's Hill on Staten Island, New York . US production began in earnest in 1899 with the discovery of large deposits in Belvidere Mountain in Vermont. The use of asbestos became increasingly widespread toward
8924-536: Was indeed used for this purpose. A once-purported first description of asbestos occurs in Theophrastus , On Stones , from around 300 BC, but this identification has been refuted. In both modern and ancient Greek , the usual name for the material known in English as "asbestos" is amiantos ("undefiled", "pure"), which was adapted into the French as amiante and into Spanish and Portuguese as amianto . In modern Greek ,
9021-483: Was marketed for use in private homes under brand names that included "Pure White", "Snow Drift" and "White Magic". The potential for use of asbestos to mitigate climate change has been raised. Although the adverse aspects of mining of minerals, including health effects, must be taken into account, exploration of the use of mineral wastes to sequester carbon is being studied. The use of mining waste materials from nickel , copper , diamond , and platinum mines have
9118-515: Was phased out, with mining having ceased in 1983. The use of asbestos was phased out in 1989 and banned entirely in December 2003. The dangers of asbestos are now well known in Australia, and there is help and support for those suffering from asbestosis or mesothelioma. Serpentine minerals have a sheet or layered structure. Chrysotile (commonly known as white asbestos) is the only asbestos mineral in
9215-547: Was presented to Parliament on 24 March 1930. It concluded that the development of asbestosis was irrefutably linked to the prolonged inhalation of asbestos dust, and included the first health study of asbestos workers, which found that 66% of those employed for 20 years or more suffered from asbestosis. The report led to the publication of the first asbestos industry regulations in 1931, which came into effect on 1 March 1932. These rules regulated ventilation and made asbestosis an excusable work-related disease. The term mesothelioma
9312-637: Was used in July 1944, towards the end of the Second World War , although its use did not gain public attention until the Vietnam War . Controlling a fire to optimize its size, shape, and intensity is generally called fire management , and the more advanced forms of it, as traditionally (and sometimes still) practiced by skilled cooks, blacksmiths , ironmasters , and others, are highly skilled activities. They include knowledge of which fuel to burn; how to arrange
9409-402: Was used in the manufacture of ammonium sulfate for purposes of rice production, sprayed upon the ceilings, iron skeletons, and walls of railroad cars and buildings (during the 1960s), and used for energy efficiency reasons as well. Production of asbestos in Japan peaked in 1974 and went through ups and downs until about 1990 when production began to drop dramatically. The 1898 Annual Report of
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