Cv versus Cp

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

Cv versus Cp

Postby Olivia Young 1A » Mon Jan 28, 2019 11:44 pm

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

Postby Felicia1E » Tue Jan 29, 2019 12:38 am

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

Postby Chloe Thorpe 1J » Tue Jan 29, 2019 11:05 am

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

Postby Hilda Sauceda 3C » Tue Jan 29, 2019 12:38 pm

yeah its always true not just for the example

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

Re: Cv versus Cp

Postby lizettelopez1F » Tue Jan 29, 2019 3:34 pm

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


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