Delta U=0 for isothermal compression?

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Sam Joslyn 1G
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Joined: Fri Sep 28, 2018 12:20 am

Delta U=0 for isothermal compression?

Postby Sam Joslyn 1G » Mon Jan 28, 2019 8:30 pm

In the 7th edition of the textbook on page 258 (section 4B), it says that delta U = 0 "for the isothermal expansion (or compression) of an ideal gas. How can an ideal gas compress isothermally without any work?

Jessica Chen 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

Re: Delta U=0 for isothermal compression?

Postby Jessica Chen 1F » Mon Jan 28, 2019 9:39 pm

delta U is 0 for it to be isothermal, but that doesn't mean work also has to be 0. Since delta U = q + w, that just means that q + w has to equal 0. Work has to cancel out the heat.


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