# Thermodynamics- validity of change of internal energy equation

1. Jun 7, 2010

### mjki9ec3

Just had a thermodynamics exam, and one of the questions was

For an ideal gas, is the relation $$\Delta$$U = mC$$_{}v$$$$\Delta$$T restricted to constant volume processes only? Why?

I wrote that it was only valid for constant volume processes, because this is what C$$_{}V$$ is defined as, however now i'm starting to think that is only true for Q, and that equation is true for any process, not just constant volume.