DH=Cp dT always?

[kelvin490]

Main Question or Discussion Point

For an ideal gas, the internal energy is a function only of temperature, so that dU = CvdT can always be applied. I am not sure whether dH=C_P dT is also always true even the pressure is not constant.

 

[Chestermiller]

For an ideal gas, the internal energy is a function only of temperature, so that dU = CvdT can always be applied. I am not sure whether dH=C_P dT is also always true even the pressure is not constant.

For an ideal gas, it is. dH = dU + d(pV) = dU + RdT=(Cv+R)dT

Chet