<Dd> C V, m = (∂ C ∂ n) V (\ displaystyle C_ (V, m) = \ left ((\ frac (\ partial C) (\ partial n)) \ right) _ (V)) = molar heat capacity at constant volume, </Dd> <P> where n is the number of moles in the body or thermodynamic system . One may refer to such a per - mole quantity as molar heat capacity to distinguish it from specific heat capacity on a per - mass basis . </P> <P> The polytropic heat capacity is calculated at processes if all the thermodynamic properties (pressure, volume, temperature) change: </P> <Dl> <Dd> C i, m = (∂ C ∂ n) (\ displaystyle C_ (i, m) = \ left ((\ frac (\ partial C) (\ partial n)) \ right)) = molar heat capacity at polytropic process . </Dd> </Dl>

What is the si unit of thermal capacity