Work in relation to pressure and volume

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Michelle Chernyak 1J
Posts: 33
Joined: Fri Sep 29, 2017 7:06 am

Work in relation to pressure and volume

Postby Michelle Chernyak 1J » Wed Jan 17, 2018 10:18 am

Why does a change in volume at constant pressure result in a negative work?

Austin Ho 1E
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am
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Re: Work in relation to pressure and volume

Postby Austin Ho 1E » Wed Jan 17, 2018 10:20 am

It does not always result in negative work. Remember that w=-Pext*delta V, thus work is only negative if the change in volume is positive. I.e., the work is negative (the system does work) if it expands. However, if the change in volume is negative, the work is positive as work is done on the system to compress it.

Hope that clarifies it.


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