Answer: In the former it is violent and rapid reaction with release of much heat energy while in the latter case it is generally slow reaction with release of less heat energy
Notes: The speed of the reaction is what distinguishes an explosive reaction from an ordinary combustion reaction. Unless the reaction occurs very rapidly, the thermally expanding gases will be moderately dissipated in the medium, with no large differential in pressure and there will be no explosion. Explosion has high intensity and produces high intensity shock waves.
