For an ideal gas the heat capacity at constant pressure is

Last updated: 6/27/2023

For an ideal gas the heat capacity at constant pressure is larger than than that at constant volume because 1 positive work is done during expansion of the gas by the external pressure 2 positive work is done during expasion by the gas against external pressure 3 positive work is done during expansion by the gas against intermolecular forces of attraction 4 more collisions occur per unit time when volume is kept constant