ESS227
Prof. Jin-Yi Yu
•Therefore, when heat is added to a gas, there will be some combination of an expansion of the gas (i.e. the work) and an increase in its temperature (i.e. the increase in internal energy):
Heat added to the gas = work done by the gas + temp. increase of the gas
                             DH =             p Da               +         Cv DT
volume change of the gas
specific heat at constant volume
2nd_law
(from Atmospheric Sciences: An Intro. Survey)