Real gas relations Heat capacity ratio

as temperature increases, higher energy rotational , vibrational states become accessible molecular gases, increasing number of degrees of freedom , lowering γ. real gas, both cp , cv increase increasing temperature, while continuing differ each other fixed constant (as above, cp = cv + nr) reflects relatively constant pv difference in work done during expansion, constant pressure vs. constant volume conditions. thus, ratio of 2 values, γ, decreases increasing temperature. more information on mechanisms storing heat in gases, see gas section of specific heat capacity.