Pressure's effect on Entropy


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Pressure's effect on Entropy

Postby rachelmackenzie3H » Sat Jan 28, 2017 9:53 am

How does a change in pressure affect the entropy of a gas? Does it just depend on how the pressure change affects the volume and/or temperature?

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Re: Pressure's effect on Entropy

Postby Jessica_Kim_3I » Sat Jan 28, 2017 10:20 am

Yes, I think it depends on whether the pressure (P), temperature (T), and volume (V) change and/or remain constant.
For example in a closed system (gases are ideal), if P increases and T=constant, you know that Volume must decrease. If V decreases then there is less space to explore and Entropy decreases. If P decreases, V has increased, and entropy has increased at constant T.
If T is not constant but V is constant, then increasing Temperature increases entropy since there is more thermal Energy.
If V and T are both changing, it depends. For example, if V and T increase (P decrease), there is greater entropy.

(I hope that helps! Please feel free to correct me if I said anything incorrect)

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