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Define calorific value of a fuel.

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It is defined as the quantity of heat released during a combustion process of a unit weight of fuel source.
It is a unit of energy.
It is usually expressed as amount of heat by the unit weight of fuel source. [ weight is expressed in kilograms].

Final answer:
The calorific value of a fuel is defined as the energy is releases during the combustion process of unit weight of fuel.

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