The chemical decomposition (burning) of a material
in which the reaction front advances into the reacted
material at less than sonic velocity.
combustion sometimes accompanied by flame, parks or
spattering of burning particles. Deflagration, although
classed as an explosion, generally implies the burning
of a substance with self-contained oxygen so that
the reaction zone advances into the unreacted material
at less than the velocity of sound in the material.
In this case, heat is transferred from the reacted
to the unreacted material by conduction and convection.
Burning rate usually less than 2,000 meters/second.