Molar Heat Capacity
The heat energy required to raise the temperature of one mole of a substance by one Kelvin.
Governing formula
C_m = Q / (n ΔT), C_p - C_v = R
SI unit
J/(mol·K)
In depth
For ideal gases, Mayer's relation states $C_p - C_v = R$. Constant-pressure heat capacity $C_p$ exceeds $C_v$ because gas does expansion work during constant-pressure heating.
Examples in the real world
Constant-volume molar heat capacity of monoatomic helium gas equal to $C_v = 1.5 R ≈ 12.47 J/(mol·K)$.