explosion is divided into physical explosions, chemical explosions, nuclear explosions.

Substance due to a sudden change in state or pressure and the formation of the explosion is called a physical explosion, physical explosion is characterized by the chemical composition of the material before and after the change. Such as steam boilers due to rapid vaporization of water, container pressure increases dramatically, the pressure exceeds the strength of the equipment can withstand the explosion, compressed gas or liquefied petroleum gas cylinders, oil drums heat explosion.

Chemical explosion is a violent chemical reaction of substances, the reaction rate is extremely fast, resulting in a large number of gases, the reaction of substances in the release of chemical energy is converted into a large amount of heat, resulting in high temperature and high pressure, the instantaneous generation of high temperature and high pressure of the gas expansion of the work done to cause the explosion, the explosion of explosives before and after the change in the chemical composition of the material. Due to atomic fission or fusion reaction, the release of nuclear energy formed by the explosion, known as nuclear explosion.

Explosion of the reaction process

Explosion, is a very rapid chemical or physical process of change of substances, in the process of change in the rapid release of great heat, and generate a large number of gases, at this time the gas as a result of instantaneous still exists in a limited space, so there is a great pressure on the objects around the point of the explosion has produced a strong pressure when the high-pressure gas rapidly expanding when the formation of the explosion. In the process of change, accompanied by rapid transformation of energy, internal energy into mechanical compression energy, and the original material or its change product, the surrounding medium to produce movement.

Air and combustible gas mixture of the explosion, air and coal dust or flour mixture of the explosion, oxygen and hydrogen mixture of the explosion, etc., are caused by chemical reactions, and these reactions are oxidation reactions. But the explosion is not always react with oxygen, such as chlorine and hydrogen gas mixture explosion is an example.