Plz expalin thai expression i think they have used partial differential but sir internal energy is function of temper. and they are using volume also plz explai

and plz tell why ther are not considering pressure also why only temp and Vol umd

ok mam

for ideal gas volume term comes out to be zero. I am sending you the derivation

In reality internal energy is a function of temperature & volume for real gas. But for ideal gas it is a function of temperature only