qTherefore, 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
(from Atmospheric
Sciences: An Intro. Survey)