Explosion

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).

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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 Abel's invention 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.

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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.

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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.

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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.

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Volume: Volume, also called capacity, is a quantification of how much space an object occupies. The SI unit for volume is the cubic metre. American spelling is cubic meter....

Energy: Energy is a fundamental quantity that every physical system possesses. Energy of physical system in a certain given state is defined as the amount of work W needed to change the state of the system from some initial state (called reference state or reference level) to the given state....

Temperatures: REDIRECT Temperature...

Explosion related Images and Photos (experimental)

Explosion	Red Explosion c.1963	Naval Battle Explosion	Taste Explosion Salt and Pepper Shakers
Atomic Explosion with Mushroom Cloud	The Big Bang Theory Computer Explosion T-Shirt	Animation of a supernova explosion to its remnant	An Explosion at the Universal Colliery Rocks the Village and Local People Rush to the Scene
Soft Watch at the Moment of First Explosion c.1954	Soft Watch at the Moment of First Explosion c.1954	Chicago: The Eight-Hour Riots Culminate in a Dynamite Explosion Directed at the Police	The Shattered Windows of an Empty Resort are Seen Following an Explosion