Explosives may be classified on how sensitive they are to triggering energy. A stable explosive may require more energy to detonate but it is safer to handle and cheaper to use.
Classes of explosives:
cost of use
requirements to explode
none to minimal energy
detonator and secondary booster
The triggering energy for a primary explosive ranges up to being hit with a hammer. Some can explode with minimal energy.
Cost of use reflects transport, storage and use.
A detonator usually is made from a small amount of a primary explosive.
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