•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
specific
heat at constant volume
(from Atmospheric Sciences: An
Intro. Survey)