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36-736: It lies near Abersychan on the hills above the valley of the Afon Llwyd , between Pontypool and Blaenavon . Varteg owes its origin to the fact that the land lease for the Blaenavon Ironworks was too big, and portions were sublet to the Nantyglo Company and part taken up by a partnership called Knight and Company which opened an iron furnace in 1802. By 1825 the Varteg works was taken over by Kenrick and Company which had three blast furnaces, by 1839 there were five furnaces in operation. In 1847 it

72-443: A shaped charge the explosive forces are focused to produce a greater local explosion; shaped charges are often used by military to breach doors or walls. The speed of the reaction is what distinguishes an explosive reaction from an ordinary combustion reaction. Unless the reaction occurs very rapidly, the thermally expanding gases will be moderately dissipated in the medium, with no large differential in pressure and no explosion. As

108-529: A cemetery which dates back to the 18th century. In 2013, a controversy erupted when Glamorgan Power chose a site for open coal mining 120 metres away from the village's primary school, Ysgol Bryn Onnen. The Torfaen council previously rejected the company's plans to mine more than 256,000 tonnes of coal from the area, citing Welsh environmental regulations requiring a buffer zone of at least 500 metres around any planned open-cast mining operations. The headmaster of Ysgol Bryn Onnen school, Ryan Parry, spoke against

144-403: A magnetic explosion . Strictly a physical process, as opposed to chemical or nuclear, e.g., the bursting of a sealed or partially sealed container under internal pressure is often referred to as an explosion. Examples include an overheated boiler or a simple tin can of beans tossed into a fire. Boiling liquid expanding vapor explosions are one type of mechanical explosion that can occur when

180-679: A merger signal of about 100 ms duration, during which time is it estimated to have radiated away nine solar masses in the form of gravitational energy. The most common artificial explosives are chemical explosives, usually involving a rapid and violent oxidation reaction that produces large amounts of hot gas. Gunpowder was the first explosive to be invented and put to use. Other notable early developments in chemical explosive technology were Frederick Augustus Abel 's development of nitrocellulose in 1865 and Alfred Nobel 's invention of dynamite in 1866. Chemical explosions (both intentional and accidental) are often initiated by an electric spark or flame in

216-401: A result, even a nuclear weapon with a small yield is significantly more powerful than the largest conventional explosives available, with a single weapon capable of completely destroying an entire city. Explosive force is released in a direction perpendicular to the surface of the explosive. If a grenade is in mid air during the explosion, the direction of the blast will be 360°. In contrast, in

252-447: A slower combustion process known as deflagration . For an explosion to occur, there must be a rapid, forceful expansion of matter. There are numerous ways this can happen, both naturally and artificially, such as volcanic eruptions , or two objects striking each other at very high speeds, as in an impact event . Explosive volcanic eruptions occur when magma rises from below, it has dissolved gas in it. The reduction of pressure as

288-543: A slower expansion that would normally not be forceful, but is not allowed to expand, so that when whatever is containing the expansion is broken by the pressure that builds as the matter inside tries to expand, the matter expands forcefully. An example of this is a volcanic eruption created by the expansion of magma in a magma chamber as it rises to the surface. Supersonic explosions created by high explosives are known as detonations and travel through shock waves . Subsonic explosions are created by low explosives through

324-537: A small portion of the mass of the explosive material. A material in which the first three factors exist cannot be accepted as an explosive unless the reaction can be made to occur when needed. Fragmentation is the accumulation and projection of particles as the result of a high explosives detonation. Fragments could originate from: parts of a structure (such as glass , bits of structural material , or roofing material), revealed strata and/or various surface-level geologic features (such as loose rocks , soil , or sand ),

360-405: A unitary authority. The Abersychan community includes Abersychan, Cwmavon , Garndiffaith , Pentwyn , Talywain , Varteg , and Victoria Village . The nearest railway stations to Abersychan are Pontypool & New Inn (3 miles), Llanhilleth (3.5 miles) and Abergavenny (7 miles). Abersychan was served by the following (disused) stations: Pentwyn , Torfaen is a small village located in

396-407: A vessel containing a pressurized liquid is ruptured, causing a rapid increase in volume as the liquid evaporates. Note that the contents of the container may cause a subsequent chemical explosion, the effects of which can be dramatically more serious, such as a propane tank in the midst of a fire. In such a case, to the effects of the mechanical explosion when the tank fails are added the effects from

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432-641: A wood fire burns in a fireplace, for example, there certainly is the evolution of heat and the formation of gases, but neither is liberated rapidly enough to build up a sudden substantial pressure differential and then cause an explosion. This can be likened to the difference between the energy discharge of a battery , which is slow, and that of a flash capacitor like that in a camera flash, which releases its energy all at once. The generation of heat in large quantities accompanies most explosive chemical reactions. The exceptions are called entropic explosives and include organic peroxides such as acetone peroxide . It

468-640: Is a stub . You can help Misplaced Pages by expanding it . Abersychan Abersychan is a town and community north of Pontypool in Torfaen , Wales , and lies within the boundaries of the historic county of Monmouthshire and the preserved county of Gwent . Abersychan lies in the narrow northern section of the Afon Lwyd valley. The town includes two schools; Abersychan Comprehensive School and Victoria Primary School; together with various shops and other amenities including Abersychan Rugby Club. Abersychan

504-425: Is a small hamlet located in the district of Abersychan. It comprises a small village school and a number of houses. A small group of houses on Incline Road mark the beginning of the village and the village boundary is near Cwmavon . Victoria Primary School is also in this area, housed in large grounds. Many homes are built around the school's boundaries. Victoria Village primary school was opened in 1903 and closed by

540-422: Is absorbed during the formation of the compound from its elements; such a reaction is called an endothermic reaction. In explosive technology only materials that are exothermic —that have a net liberation of heat and have a negative heat of formation—are of interest. Reaction heat is measured under conditions either of constant pressure or constant volume. It is this heat of reaction that may be properly expressed as

576-424: Is formed from its constituents, heat may either be absorbed or released. The quantity of heat absorbed or given off during transformation is called the heat of formation . Heats of formations for solids and gases found in explosive reactions have been determined for a temperature of 25 °C and atmospheric pressure, and are normally given in units of kilojoules per gram-molecule. A positive value indicates that heat

612-407: Is the rapid liberation of heat that causes the gaseous products of most explosive reactions to expand and generate high pressures . This rapid generation of high pressures of the released gas constitutes the explosion. The liberation of heat with insufficient rapidity will not cause an explosion. For example, although a unit mass of coal yields five times as much heat as a unit mass of nitroglycerin ,

648-461: The Ebbw Vale Company in 1852, before closing in 1889. On 6 February 1890, an underground explosion at Llanerch Colliery killed 176. The site of the former ironworks today is a core site of 71 hectares (180 acres), and a total land area of 526 hectares (1,300 acres), includes a number of listed buildings: Various proposals have been made over the years to redevelop the site, currently under

684-566: The Tunguska event of 1908 is believed to have resulted from a meteor air burst . Black hole mergers, likely involving binary black hole systems, are capable of radiating many solar masses of energy into the universe in a fraction of a second, in the form of a gravitational wave . This is capable of transmitting ordinary energy and destructive forces to nearby objects, but in the vastness of space, nearby objects are rare. The gravitational wave observed on 21 May 2019, known as GW190521 , produced

720-442: The "heat of explosion." A chemical explosive is a compound or mixture which, upon the application of heat or shock, decomposes or rearranges with extreme rapidity, yielding much gas and heat. Many substances not ordinarily classed as explosives may do one, or even two, of these things. A reaction must be capable of being initiated by the application of shock, heat, or a catalyst (in the case of some explosive chemical reactions) to

756-613: The Sun, and presumably on most other stars as well. The energy source for solar flare activity comes from the tangling of magnetic field lines resulting from the rotation of the Sun's conductive plasma. Another type of large astronomical explosion occurs when a meteoroid or an asteroid impacts the surface of another object, or explodes in its atmosphere , such as a planet. This occurs because the two objects are moving at very high speed relative to each other (a minimum of 11.2 kilometres per second (7.0 mi/s) for an Earth impacting body ). For example,

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792-410: The burning substance into heat released to the surroundings, while in the latter, fast combustion ( i.e. detonation ) instead converts more internal energy into work on the surroundings ( i.e. less internal energy converted into heat); c.f. heat and work (thermodynamics) are equivalent forms of energy. See Heat of Combustion for a more thorough treatment of this topic. When a chemical compound

828-429: The casing surrounding the explosive, and/or any other loose miscellaneous items not vaporized by the shock wave from the explosion. High velocity, low angle fragments can travel hundreds of metres with enough energy to initiate other surrounding high explosive items, injure or kill personnel, and/or damage vehicles or structures. Classical Latin explōdō means "to hiss a bad actor off the stage", "to drive an actor off

864-414: The coal cannot be used as an explosive (except in the form of coal dust ) because the rate at which it yields this heat is quite slow. In fact, a substance that burns less rapidly ( i.e. slow combustion ) may actually evolve more total heat than an explosive that detonates rapidly ( i.e. fast combustion ). In the former, slow combustion converts more of the internal energy ( i.e. chemical potential ) of

900-452: The council in 2018. The last head of the school was Miss Joy Dando. And caretaker Miss Debbie Williams. [REDACTED] Media related to Abersychan at Wikimedia Commons Explosion An explosion is a rapid expansion in volume of a given amount of matter associated with an extreme outward release of energy , usually with the generation of high temperatures and release of high-pressure gases . Explosions may also be generated by

936-584: The discovery of iron stone locally, the principal ironworks were built by the British Iron Company in 1825, served mainly by the London and North Western Railway's Brynmawr and Blaenavon Railway . The ironwork's main office building and quadrangle were designed by architect Decimus Burton , best known for his design of London Zoo . The works passed to the New British Iron Company in 1843 and to

972-453: The district of Abersychan. It contains a post office, several houses and a small play park. The village has a cricket team (Pontnewynydd CC) and is located right next to the old railway line. The cricket club celebrated its 100-year anniversary in 2006 with a successful tour to Cork , Ireland. The village has superb views over the River Severn and Newport to the south. Victoria Village

1008-428: The explosion resulting from the released (initially liquid and then almost instantaneously gaseous) propane in the presence of an ignition source. For this reason, emergency workers often differentiate between the two events. In addition to stellar nuclear explosions , a nuclear weapon is a type of explosive weapon that derives its destructive force from nuclear fission or from a combination of fission and fusion. As

1044-411: The magma rises causes the gas to bubble out of solution, resulting in a rapid increase in volume, however the size of the magma chamber remains the same. This results in pressure buildup that eventually leads to an explosive eruption. Explosions can also occur outside of Earth in the universe in events such as supernovae , or, more commonly, stellar flares. Humans are also able to create explosions through

1080-508: The ownership of HSBC , but none have so far passed the requirements of Torfaen county council. Abersychan constitutes a community and electoral ward of the county borough of Torfaen . The area was part of the ancient parish of Trevethin , in Monmouthshire . On 3 June 1864 Abersychan was constituted a local government district, governed by a local board . In 1894 Abersychan became an urban district and civil parish . The urban district

1116-419: The presence of oxygen. Accidental explosions may occur in fuel tanks, rocket engines, etc. A high current electrical fault can create an "electrical explosion" by forming a high-energy electrical arc which rapidly vaporizes metal and insulation material. This arc flash hazard is a danger to people working on energized switchgear . Excessive magnetic pressure within an ultra-strong electromagnet can cause

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1152-502: The proposal, citing health concerns and impact on learning. Also in 2013, the village made international headlines when it was reported the Welsh Language Commissioner had proposed changing the official spelling of the town's name to 'Y Farteg' in-line with Welsh orthography. 51°44′52″N 3°03′58″W  /  51.74786°N 3.06605°W  / 51.74786; -3.06605 This Torfaen location article

1188-430: The use of explosives , or through nuclear fission or fusion , as in a nuclear weapon . Explosions frequently occur during bushfires in eucalyptus forests where the volatile oils in the tree tops suddenly combust. Among the largest known explosions in the universe are supernovae , which occur after the end of life of some types of stars . Solar flares are an example of common, much less energetic, explosions on

1224-491: Was abolished in 1935, with most of its area passing to Pontypool urban district, and a small area going to Abercarn UD. In 1974 the area became part of the borough of Torfaen, in the new local government county of Gwent . The community of Abersychan was formed in 1985, but no community council has yet been formed. Abersychan and Cwmavon is now a ward for the Pontypool Community Council. In 1996 Torfaen became

1260-650: Was owned by Williams and Co with a total of eight furnaces at Varteg, Golynos and Pentwyn. From 1854 to closure in 1868 it was owned by the Golynos Iron Co. After the end of iron making, coal mining became the biggest employer. Varteg has one of the three Welsh language medium primary school in Torfaen, namely Ysgol Bryn Onnen. The others are Ysgol Gymraeg Cwmbrân, in Cwmbrân, and Ysgol Panteg, in Griffithstown. It also has

1296-428: Was the birthplace of the politicians Roy Jenkins , Don Touhig and Paul Murphy (member of parliament for Torfaen); and of the rugby footballers Wilfred Hodder , Candy Evans and Bryn Meredith . Like many of the 17th century isolated agricultural hamlets in the forested South Wales Valleys, Abersychan became a thriving industrial centre in the 19th and early 20th centuries, particularly for iron production. After

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