## Irreversible Entropy Changes

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

mcredi
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

### Irreversible Entropy Changes

When talking about entropy change due to temperature change when the process was done irreversibly, why do we use deltaS = nRln(t/t)

Elisa Bass 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### Re: Irreversible Entropy Changes

Because ∆S = qrev/T, if you’re looking for change in entropy due to temperature change, you can substitute out q for nC∆T, then simplify to get ∆S = nCln(T2/T1).