"An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances.
The potential energy stored in an explosive material may, for example, be
chemical energy, such as nitroglycerin or grain dust
pressurized gas, such as a gas cylinder, aerosol can, or BLEVE" - (en.wikipedia.org 10.10.2021)
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