Difference between propellant and explosive
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Often times the word “explosive” is used interchangeably for propellants and
true explosives. However, the distinction between these two terms is critical
when discussing the pressures formed during a reaction which takes place inside
an oxygen bomb.
Chemical explosives can be classified as low or high explosives. Low (or
deflagrating) explosives are used primarily for propelling; they are mixtures of
readily combustible substances that when ignited undergo rapid combustion.
Propellants are often materials such as gun powders, smokeless powders or
liquid fuels. Generally, propellants burn in a predicable manner at a controlled
rate.
High (or detonating) explosives (e.g., TNT) are used mainly for shattering;
they are unstable molecules that can undergo explosive decomposition without
any external source of oxygen and in which the chemical reaction produces rapid
shock waves. In an explosion, the reaction products fill a much greater volume
than that occupied by the original material and exert an enormous amount of
pressure
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