Entropy Decreasing, Temperature Increasing

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alicechien_4F
Posts: 104
Joined: Sat Jul 20, 2019 12:15 am

Entropy Decreasing, Temperature Increasing

Postby alicechien_4F » Wed Feb 05, 2020 5:39 pm

For problems like 4F.1 and 4F.3, why does change in entropy decrease when temperature is increased? I understand that the equation delta(S) = q/T so increasing the denominator will increase delta(S), but can someone explain conceptually why entropy decreases when temperature increases? I thought higher temperature would have higher entropy because the molecules have more kinetic energy.

Jordan Young 2J
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Joined: Thu Jul 25, 2019 12:17 am
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Re: Entropy Decreasing, Temperature Increasing

Postby Jordan Young 2J » Wed Feb 05, 2020 6:22 pm

In questions 4F.1 and 4F.3, they are saying that the change in entropy is less when the object is at a higher temperature, not that entropy is decreasing.

Amanda Lin 2I
Posts: 101
Joined: Sat Aug 17, 2019 12:15 am

Re: Entropy Decreasing, Temperature Increasing

Postby Amanda Lin 2I » Wed Feb 05, 2020 10:11 pm

Because there is already more disorder at a higher temperature, there will not be as great of a change in entropy.

chemboi
Posts: 101
Joined: Sat Jul 20, 2019 12:16 am

Re: Entropy Decreasing, Temperature Increasing

Postby chemboi » Wed Feb 05, 2020 11:18 pm

This ties in with the formula deltaS = (q reversible) / T , so with higher T the change in S is reduced.

Anisha Chandra 1K
Posts: 118
Joined: Thu Jul 11, 2019 12:17 am

Re: Entropy Decreasing, Temperature Increasing

Postby Anisha Chandra 1K » Thu Feb 06, 2020 9:57 am

Entropy doesn't decrease with temperature, but the entropy change decreases with higher temperature. This is because a change to a lower temperature system will affect it more drastically than it would affect the higher temperature system, since it already has a higher entropy.

aishwarya_atmakuri
Posts: 101
Joined: Sat Jul 20, 2019 12:15 am

Re: Entropy Decreasing, Temperature Increasing

Postby aishwarya_atmakuri » Thu Feb 06, 2020 11:02 am

At a higher temperature, entropy is already higher than it would be at a lower temperature. As a result, the change in entropy will be lower.

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

Re: Entropy Decreasing, Temperature Increasing

Postby Leila_4G » Fri Feb 07, 2020 3:20 pm

Why/when does entropy have a negative value? I thought that entropy only increases? Or is that only for the entire universe?


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