what is calorific value class 8

The calorific value of a fuel is defined as the amount of heat energy released during the complete combustion of a unit mass of the fuel. It is expressed in kilojoules per kilogram (kJ/kg). A higher calorific value indicates a more efficient fuel, as it produces more heat when burned. For example, LPG has a calorific value of 55000 kJ/kg, which means it releases a large amount of heat energy when completely combusted