## -w vs +w

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Kassandra Molina 2B
Posts: 43
Joined: Wed Nov 16, 2016 3:03 am

### -w vs +w

Just to clarify: if work is positive that means expansion and if it is negative it means compression?

Kaylin Krahn 1I
Posts: 57
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

### Re: -w vs +w

If work is done by the system, -w, it means expansion. If work is done onto the system, +w, it means compression.

Tim Nguyen 2J
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

### Re: -w vs +w

If work is negative, the system is losing energy as it uses it to expand.

If work is positive, the system is gaining energy as it gains it from the compressing force.