Fire is a fundamental chemical reaction based on oxidation . Explosion is a two-tiered chemical reaction based on the volatility of mixing at least two substances. It is produced from the breaking and formation of chemical bonds. In a chemical reaction, atoms are not lost but merely redistributed. Molecules absorb energy when their chemical bonds are broken apart, and release energy when their bonds are reformed.
Reactions also take place at various rates of speed .
Pyrolysis only takes place when fire has a continuous source of oxygen. How quickly reactions move through these three ranges is the speed of the reaction. Speed can be increased by temperature, however, as any 18 degree Fahrenheit increase in temperature usually doubles or triples the reaction rate. Fires, for example, burn faster once they can raise the environment's temperature. However, it's not a simple matter as the external supply of oxygen.