The fire triangle and fire tetrahedron explain how fire occurs under a favorable condition. The former concept include the three basic elements, namely: fuel, heat and oxygen in order for fire to prosper. These three components permit combustion to happen.
Combustion is defined as a rapid, self-sustaining process that combines oxygen with another substance. This, in turn, results in the release of heat. Thus, in effect, it can be simply put as rapid oxidation. Oxidation, on the other hand, is the process of combining oxygen with another substance to create a new compound.
The fire tetrahedron includes the fourth element, chemical chain reaction, which is a must to maintain a self-sustaining fire. It is a very complicated series of reactions at the molecular level that keeps the fire burning. It has been said that a fire cannot occur without all four components. Under normal conditions, these chain reactions will continue as long as there is sufficient source of heat, fuel and oxygen.
In conclusion, one method of stopping a fire is by way of introducing other chemicals like HCFC-123 to break the sequence of chemical chain reactions.
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