Explosive material is a substance that can burn violently (i.e. explode) in a very short period of time. It is a substance that explodes from its own energy under the action of certain external energy. In general, the chemical and physical properties of explosives are stable, but regardless of whether the environment is sealed, the amount of charge, or even in the absence of external oxygen supply, as long as there is strong energy (provided by the initiating explosive) to excite, explosives will perform stable explosive work on the outside world.