Because of its slow decomposition rate and consequently low brisance, gunpowder is classified as a low explosive, that is, it produces a subsonic deflagration wave rather than the supersonic detonation wave produced by brisants, or high explosives. The gases produced by burning gunpowder generate enough pressure to propel a bullet, but not enough to destroy the barrel of a firearm.
更新1:
Gunpowder is a pyrotechnic composition, an explosive mixture that burns rapidly, producing volumes of hot gas which can be used as a propellant in firearms and fireworks. 請解埋呢段~
