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Gasoline explosions, simulating bomb drops at an airshow.
An explosion is a sudden increase in volume and release of energy in a violent manner, usually with the generation of high temperatures and the release of gases. An explosion causes pressure waves in the local medium in which it occurs. Explosions are categorized as deflagrations if these waves are subsonic and detonations if they are supersonic (shock waves).
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 discovered and put to use. Other notable early developments in chemical explosive technology were Frederick Augustus Abel's development of nitrocellulose (guncotton) in 1865 and Alfred Nobel's invention of dynamite (stabilized nitroglycerin). See the article on explosive material for more detail on chemical explosives. A new order of explosive, the nuclear bomb, was invented in 1945 by the United States military. In 1950, the US military developed the first fusion bomb. Boiling liquid expanding vapour explosions are a type of explosion that can occur when a vessel containing a pressurized liquid is ruptured, causing a rapid increase in volume as the liquid evaporates.
Explosions are common in nature. On Earth, most natural explosions arise from volcanic processes of various sorts. Explosive volcanic eruptions occur when magma rising from below has much dissolved gas in it; the reduction of pressure as the magma rises causes the gas to bubble out of solution, resulting in a rapid increase in volume. Explosions also occur as a result of Earth impacts. On other planets, vulcanism and impacts cause explosions with various frequency.
Solar flares are an example of explosion common on 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.
Among the largest known explosions in the universe are supernovae, which result from stars exploding, and gamma ray bursts, whose nature is still in some dispute.
Famous explosions
- Chemical explosions
- Texas City Disaster
- Halifax Explosion
- Battle of Messines
- Bombay Blasts
- Oppau explosion, Ludwigshafen, Germany
- Port Chicago Disaster
- 1887 Nanaimo Mine Explosion
- PEPCON disaster, Henderson, Nevada
- Flixborough disaster
- Hertfordshire Oil Storage Terminal
- Nuclear weapons (nuclear explosions)
- Nuclear testing
- Trinity test
- Castle Bravo
- Tsar Bomba (most powerful nuclear weapon ever created)
- use in war
A weapons cache is detonated at the East River Range on Bagram Airfield, Afghanistan
- Exploding volcanoes
- Santorini
- Krakatoa
- Mount Tambora
- Mount Pinatubo
- Yellowstone Caldera
- Astronomic-scale events
- The big bang
- Tunguska event
- Comet Shoemaker-Levy 9
- Crab Nebula supernova
- Exploding animals
See also
- Explosive limit
- Implosion
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "explosion".
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