Räjähdeaine

Räjähdeaine is a Finnish term that translates to "explosive substance" or "explosive material." It refers to any chemical compound or mixture that, under certain conditions, undergoes rapid decomposition, producing a large volume of gas and heat. This rapid expansion of gases creates a shockwave, resulting in an explosion.

Explosive substances are broadly categorized into two main types: high explosives and low explosives. High explosives detonate, meaning they propagate a detonation wave through the material at supersonic speeds. Examples include dynamite, TNT, and RDX. Low explosives deflagrate, burning at subsonic speeds. Gunpowder is a common example of a low explosive.

The use of explosive substances is diverse and ranges from industrial applications like mining and demolition to military purposes and pyrotechnics. Their handling and storage are strictly regulated due to their inherent dangers. The chemical structure of an explosive substance typically involves an unstable molecule that can readily release a significant amount of energy. Factors such as initiation (shock, heat, friction), confinement, and quantity influence the likelihood and severity of an explosion. The study of explosive substances and their behavior falls under the field of energetic materials science.