## Cv Cp

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Ruby Richter 2L
Posts: 103
Joined: Thu Jul 25, 2019 12:17 am

### Cv Cp

How do you know when to use Cv vs Cp?

Viviana Velasquez
Posts: 97
Joined: Sat Jul 20, 2019 12:15 am

### Re: Cv Cp

You use it depending on whether you are solving for heat at constant pressure or constant volume. Often times the problem will tell you directly whether it is constant pressure or volume and other times you will have to read the problem carefully and deduce which one it is at.

Julia Holsinger_1A
Posts: 50
Joined: Tue Feb 26, 2019 12:16 am

### Re: Cv Cp

For constant pressure the equation is W= -P(delta)V , what is the equation for constant volume?

Gabriella Bates 2L
Posts: 113
Joined: Thu Jul 11, 2019 12:15 am

### Re: Cv Cp

Julia Holsinger_1A wrote:For constant pressure the equation is W= -P(delta)V , what is the equation for constant volume?

This is the equation for work, not Cv or Cp. However since (delta)V = 0 at constant volume, then w = 0. Therefore, the system does no work