According to energy sources, explosions can be divided into three types: nuclear explosion, chemical explosion and physical explosion, and chemical explosion can be divided into three types: simple decomposition explosion, complex decomposition explosion and explosive mixture explosion. Among the three kinds of explosions, nuclear explosion is the most destructive, and its energy is equivalent to thousands to tens of thousands of tons of TNT explosives. The explosions of atomic bombs, hydrogen bombs and neutron bombs are all nuclear explosions.

1, physical explosion

Physical explosion refers to the phenomenon that the volume of liquid or gas in a container expands rapidly due to physical changes (temperature, volume, pressure, etc.). ), resulting in a sharp rise in the pressure of the container, the container exploded due to overpressure or stress change, and the nature and chemical composition of the substance did not change before and after the explosion. For example, steam boilers and liquefied steel cylinders are all physical explosions. Although the physical explosion itself has no combustion reaction, its impact force may indirectly or indirectly cause a fire.

2. Chemical explosion

Chemical explosion refers to the explosion phenomenon caused by the chemical reaction of the substance itself, which produces a large amount of gas temperature, temperature and pressure rise or both. For example, when combustible gas, steam or a mixture of dust and air meets an open flame, the explosion of explosives is a chemical explosion. The main characteristics of chemical explosion are fast reaction speed, which releases a lot of heat energy, produces a lot of gas and great pressure, and makes great noise. Chemical explosion can directly cause fire, which is very destructive and is the key point of prevention in fire control work.

3. Nuclear explosion

Nuclear explosion refers to the explosion caused by the release of nuclear energy by nuclear fission or fusion reaction. Such as atomic bombs, hydrogen bombs and neutron bombs, are all nuclear explosions.