## Vacuum Scenario

$\Delta U=q+w$

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Janelle Lau 3K
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Joined: Fri Sep 25, 2015 3:00 am

### Vacuum Scenario

If a closed container was placed inside a vacuum piston, and its volume changes, would we use w=-P$\Delta$V? In that case, since its external pressure is equal to 0 atm, would that make work=0?

Annie Qing 2F
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

### Re: Vacuum Scenario

Yes. Since the external pressure is zero, this is free expansion (nothing to expand against) and the work done is also equal to zero.

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