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combustion and thermal cracking
Combustion is a chemical reaction chemical that occurs between a fuel and an oxidizing agent that produces energy, usually in the form of heat and light.

Thermal cracking is a process of breaking down large complex organic molecules of hydrocarbon in the absence of air and at high temperatures of above 500°c and 700°C and applying high pressure up to 70 atmospheres, in to useful and smaller hydrocarbons.
The thermal cracking involves the breaking of C-C and C-H bonds. In the process of thermal cracking, the C-C bonds are broken in the presence of acid.


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