How can a change in entropy be negative?






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John_Richey_4A
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How can a change in entropy be negative?

Postby John_Richey_4A » Sat Feb 23, 2019 7:36 pm

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Marcela Udave 1F
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Joined: Fri Sep 28, 2018 12:16 am

Re: How can a change in entropy be negative?

Postby Marcela Udave 1F » Sat Feb 23, 2019 8:13 pm

If there is less disorder in a system, then entropy is negative.
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Tuong-Minh Tran 1C
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Joined: Fri Sep 28, 2018 12:19 am

Re: How can a change in entropy be negative?

Postby Tuong-Minh Tran 1C » Sat Feb 23, 2019 8:16 pm

A change in entropy can be negative if energy is able to escape the system. Technically, in the universe, entropy is always increasing, but if we only consider the earth as a system, then entropy can decrease.
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Henry Dudley 1G
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Re: How can a change in entropy be negative?

Postby Henry Dudley 1G » Sat Feb 23, 2019 11:03 pm

An example of this would be a liquid being cooled into a solid. The molecules have less possible positions and therefore have less entropy leading to a decrease in entropy or negative entropy change.
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