## Change in Entropy due to Change in Pressure?

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

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Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

### Change in Entropy due to Change in Pressure?

Are we expected to include the change in entropy due to change in pressure when we are adding up the entropies to find the total change in entropy? I was doing some practice problems and there was a change in volume, temperature, and pressure (I found that out by using PV = nRT and saw that the values for P were different). I calculated the delta S for all of those three parameters and added them up, but the answer wanted me only to add up the delta S (of volume) and the delta S (of temperature). I'm confused as to whether or not I should include the delta S due to delta P in my calculation, because there was indeed a change in pressure.

Sue Bin Park 2I
Posts: 52
Joined: Mon Jun 17, 2019 7:24 am

### Re: Change in Entropy due to Change in Pressure?

was wondering this too. also, how did you find entropy from change in pressure exactly?

Sue Bin Park 2I
Posts: 52
Joined: Mon Jun 17, 2019 7:24 am

### Re: Change in Entropy due to Change in Pressure?

oh wait...did you use the ∆S = nR ln(V2/V1) but replace volume ratio with (P1/P2)?

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