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Work in relation to pressure and volume

Posted: Wed Jan 17, 2018 10:18 am
by Michelle Chernyak 1J
Why does a change in volume at constant pressure result in a negative work?

Re: Work in relation to pressure and volume

Posted: Wed Jan 17, 2018 10:20 am
by Austin Ho 1E
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.