What is Explosive material?
'''Explosives''' are [[chemical]] [[chemical compound|compounds]] that cause [[explosions]]; they flare up and burst with a loud [[sound]]. Explosive material has many special characteristics: it is a [[Chemical stability|chemically unstable]] material, it changes its form very fast and, while changing its form, it explodes by bursting and making loud sounds. There are two types of explosives: low explosives and high explosives. This classification depends on their rate of explosion. Low explosives ''conflagrate'' (= burn very fast). High explosives ''[[Detonation|detonate]]'' (= explode with bursts). A low explosive is a material, which burns very fast, but does not explode generally. For exploding them, people mix them with high explosives. Sometimes, even a low explosive may detonate. A high explosive bursts and explodes very fast. High explosives produce more pressure than low explosives but low explosives are more safe to use. People use low explosives in fuses, [[rocket engine]]s and [[fireworks]], and high explosives in [[mining]] and demolition (destroying old bridges and buildings). [[Gun]]<nowiki/>s use low explosives as [[propellant]]<nowiki/>s; most [[bomb]]<nowiki/>s use high explosives. [[Gunpowder]]<ref>{{cite web | url=https://www.thoughtco.com/gunpowder-facts-and-history-607754 | title=Learn How Gunpowder Works }}</ref> and [[ammonium nitrate]] are low explosives. High explosives may belong to different groups: primary explosives and secondary explosives. Primary explosives are very unstable and rapidly react to shock, [[friction]], and [[heat]]. Any shock, friction, or heat makes primary explosives to burn or blast fast. Secondary explosives are much more safe to use and do not react very fast to shock, friction, and heat. Any shock, friction, or heat may burn such explosives, but not make them to burst and blast. Some people call secondary explosives as base explosives. Some people also tell about another group of explosives. These are tertiary explosives. These explosives do not react to