4F.9
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Simon Dionson 4I
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4F.9
If the pressure of a gas in a container is decreased isothermally, wouldn't the entropy change be negative? The answer key is saying that it is positive.
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Sean Cheah 1E
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Re: 4F.9
Because the process is isothermal, q = -w. Decreasing pressure must mean that volume is increasing, therefore work is negative. Then q is positive and delta S = q/T is also positive.
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Simon Dionson 4I
- Posts: 107
- Joined: Sat Sep 14, 2019 12:17 am
Re: 4F.9
Sean Cheah 1E wrote:Because the process is isothermal, q = -w. Decreasing pressure must mean that volume is increasing, therefore work is negative. Then q is positive and delta S = q/T is also positive.
Oh, that makes sense. Thank You! I think I interpreted decreasing pressure as decreasing volume.
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