## Gas Expansion

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Joyce Gu 1E
Posts: 29
Joined: Tue Nov 24, 2015 3:00 am

### Gas Expansion

If ΔU=0, why would gas expand?

Virpal Gill 1B
Posts: 32
Joined: Thu Jul 27, 2017 3:00 am

### Re: Gas Expansion

Because maybe there is more volume available to it. If it expanded isothermally, then the kinetic and potential energies of the molecules would still be the same, so the internal energy would remain the same. However, if the temperature changed during expansion, the internal energy would not remain the same. It would increase if temperature was raised and decrease if temperature was lowered.