The four basic principles of fire fighting are as follows

The four basic principles of fire fighting are cooling fire fighting, isolation fire fighting, suffocation fire fighting and chemical fire fighting. 1, cooling and extinguishing: for combustible solids, cool to below the ignition point; For flammable liquids, if cooled below the flash point, the combustion reaction may stop. 2. Isolation and fire fighting: Foam covers the surface of burning liquid or solid, which can cool and isolate combustible substances from air, thus achieving the purpose of fire fighting.

The four basic principles of fire fighting are cooling fire fighting, isolation fire fighting, suffocation fire fighting and chemical fire fighting.

1, cooling and extinguishing: for combustible solids, cool to below the ignition point; For flammable liquids, if cooled below the flash point, the combustion reaction may stop.

2. Isolation and fire fighting: Foam covers the surface of burning liquid or solid, which can cool and isolate combustible substances from air, thus achieving the purpose of fire fighting.

3. Asphyxiation and fire fighting: In the fire field, the oxygen concentration in the space can be reduced by injecting non-combustible gases, such as carbon dioxide, nitrogen and steam (water spray), so as to achieve the purpose of asphyxiation and fire fighting.

4. Chemical suppression and fire extinguishing: Since flame combustion is carried out through chain reaction, if the generation of free radicals can be effectively suppressed or the concentration of free radicals in the flame can be reduced, the combustion can be stopped.