U=0


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paytonm1H
Posts: 74
Joined: Fri Sep 28, 2018 12:18 am

U=0

Postby paytonm1H » Fri Mar 15, 2019 10:48 pm

is the change in internal energy always equal to zero for isothermal, reversible expansion?

skyeblee2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: U=0

Postby skyeblee2F » Fri Mar 15, 2019 11:24 pm

When dealing with an ideal gas (which we pretty much always are in this class), the ∆U is 0 for every isothermal process. In the case os isothermal reversible expansion, ∆U=q+w=0 so q=-w

Roberto Gonzalez 1L
Posts: 39
Joined: Fri Sep 28, 2018 12:17 am

Re: U=0

Postby Roberto Gonzalez 1L » Sun Mar 17, 2019 5:40 pm

Yes, for ideal gases; reversible expansion the total change in internal energy should be 0 while q and w are the ones that vary depending on the situation.

Anita Wong 1H
Posts: 68
Joined: Fri Sep 28, 2018 12:27 am
Been upvoted: 2 times

Re: U=0

Postby Anita Wong 1H » Sun Mar 17, 2019 5:42 pm

yes! deltaU= 0 for isothermal reversible expansion

harshitasarambale4I
Posts: 58
Joined: Fri Sep 28, 2018 12:26 am

Re: U=0

Postby harshitasarambale4I » Sun Mar 17, 2019 5:58 pm

When U=0 is w=-q always true?

Anjali 4A
Posts: 59
Joined: Fri Sep 28, 2018 12:28 am

Re: U=0

Postby Anjali 4A » Sun Mar 17, 2019 7:31 pm

Yes, I think w always =-q

Helen Mejia 1I
Posts: 67
Joined: Fri Sep 28, 2018 12:24 am

Re: U=0

Postby Helen Mejia 1I » Sun Mar 17, 2019 10:14 pm

yes it is equal to zero.


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