Calorific value is a property of a substace to produce heat.
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Anjali Goenka answered this
the heating value or calorific value of a substance, usually a fuel or food, is the amount of heat released during the combustion of a specified amount of it. the calorific value is a characteristic for each substance. it is measured in units of energy per unit of the substance, usually mass, such as: kcal/kg, kJ/kg, J/mol, Btu/m³. heating value is commonly determined by use of a bomb calorimeter