State the units of calorific value?

Calorific value is typically expressed in units of energy per unit mass or volume. Common units include joules per kilogram (J/kg), calories per gram (cal/g), and British Thermal Units per pound (BTU/lb). For gaseous fuels, it may also be expressed in megajoules per cubic meter (MJ/m³). These units indicate the amount of energy released when a specific quantity of fuel is combusted.