## Cv versus Cp

Olivia Young 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

### Cv versus Cp

In lecture, it said that Cp > Cv. Is this always true, or was that just for one example? If it is always true, why?

Felicia1E
Posts: 31
Joined: Fri Sep 28, 2018 12:22 am

### Re: Cv versus Cp

Yes, Cp is always greater than Cv. This is because when temperature changes under constant pressure there is extra work being done to change the volume. If all else is constant, when temperature increases, volume must increase too. This is as opposed to constant volume in Cv.

Chloe Thorpe 1J
Posts: 77
Joined: Fri Sep 28, 2018 12:16 am

### Re: Cv versus Cp

It also helps if you look at the calculation. For atoms, Cv is 3/2*R (R being a constant), while for Cp it is 5/2*R.

Hilda Sauceda 3C
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

### Re: Cv versus Cp

yeah its always true not just for the example

lizettelopez1F
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

### Re: Cv versus Cp

Cp is always greater because of the work of expansion it has to do.