## U=0

$\Delta U=q+w$

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

### U=0

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

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

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

yes! deltaU= 0 for isothermal reversible expansion

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

### Re: U=0

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

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

### Re: U=0

Yes, I think w always =-q

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

### Re: U=0

yes it is equal to zero.