- 51

- 1

*"For an ideal gas, but for every kind of transformation ∆u=Cv ∆T, while for every kind of material in the thermodynamic system, but only for isochoric transformation ∆u=Cv ∆T."*

Where does this second statement come from?

Everything is clear about ideal gases, but I don't figure out how to prove the second part of this statement.