Amar Kumar12 Years agoAt 0 kelvin ,cp = cv as cp - cv = - T(δV/δT)2 * (δP/δT) for real gas here (δV/δT) and (δP/δT) at constant temp. as T → 0 k , cp → cv ,so cp = cv Thanks & Regards Amar Kumar, askIITians Faculty M.Tech, IIT Delhi