'Explosives are substances that, through chemical reaction, rapidly and violently change to a gas, accompanied by high temperatures, extreme shock and a loud noise. An explosion is the process of a substance transforming into the gaseous state. Explosives are classified as low or high according to the detonating velocity or speed at which this change takes place and other pertinent characteristics such as their shattering effect. An arbitrary figure of 3,300 fps (feet per second) is used to distinguish between burning/deflagration (low explosive) and detonation (high explosive).'