Fuel is a combustible substance, containing carbon as the main constituent, which on proper burning gives large amount of heat and this can be used economically for domestic and industrial purposes. Example wood, charcoal, kerosene, petrol.

During combustion of a fuel, the atoms of carbon, hydrogen etc. combine with oxygen with simultaneous liberation of heat at a rapid rate. Energy is liberated due to rearrangement of valence electrons. The new compounds formed have lesser energy. The energy released during combustion process is the difference in the energy of reactants and products. The primary or main fuels.

Fuel + O2  Products + heat


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