## Constant pressure vs. Constant volume

$\Delta U=q+w$

William Lan 2l
Posts: 73
Joined: Fri Sep 29, 2017 7:07 am

### Constant pressure vs. Constant volume

Why is the heat capacity at constant pressure greater than heat capacity at constant volume?

Matthew 1C
Posts: 47
Joined: Fri Sep 29, 2017 7:06 am

### Re: Constant pressure vs. Constant volume

In constant volume the system doesn't expand, so the heat added will only go towards increasing temperature. However, expansion can occur at constant pressure, and some of the heat added will be spent on that expansion, along with increasing temperature. Since some of the heat will be spent in expansion, the heat capacity is greater in systems with constant pressure than those with constant volume.

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