- published: 02 May 2016
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An explosive material, also called an explosive, is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material.
This potential energy stored in an explosive material may be
Explosive materials may be categorized by the speed at which they expand. Materials that detonate (explode faster than the speed of sound) are said to be "high explosives" and materials that deflagrate are said to be "low explosives". Explosives may also be categorized by their sensitivity. Sensitive materials that can be initiated by a relatively small amount of heat or pressure are primary explosives and materials that are relatively insensitive are secondary explosives.
Though early thermal weapons, such as Greek fire, have existed since ancient times, the first widely used explosive in warfare and mining was black powder, invented in 9th century China (see the history of gunpowder). This material was sensitive to water, and evolved lots of dark smoke. The first useful explosive stronger than black powder was nitroglycerin1, developed in 1847. As nitroglycerin was unstable, it was replaced by nitrocellulose, smokeless powder, dynamite and gelignite (the two latter invented by Alfred Nobel). World War II saw an extensive use of new explosives (see explosives used during World War II). In turn, these have largely been replaced by modern explosives such as trinitrotoluene and C-4.
Actors: Yung-sheng Pan (miscellaneous crew), Cheung-Yan Yuen (director), Jason Pai Piao (miscellaneous crew), Suet Lam (actor), Simon Yam (actor), Sai-Kit Yung (actor), Kwok Choi Hon (actor), Ching Wan Lau (actor), Ching Wan Lau (actor), Jang Lee Hwang (actor), Wen Tai Li (actor), Eddy Ko (actor), Hsiang Lin Yin (actor), Steve Tartalia (actor), Kuo-kuang Tsai (actor),
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