is a relatively slow explosion
, generating only subsonic
pressure waves. This sort of explosion is usually produced by rapid chemical combustion
reactions, for instance of gunpowder
in a firearm, or fuel
in an internal combustion engine
. Contrast detonation
, where the pressure waves are supersonic
Deflagrations are easier to control than detonations, and better suited when the goal is to move an object (a bullet in a gun, or a piston in an engine) with the force of the expanding gas.
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