C(v) and C(p)

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manasa933
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am

C(v) and C(p)

Postby manasa933 » Fri Jan 19, 2018 10:28 am

Why is that C(under constant pressure) is greater than C(under constant volume) for gases and not liquids and solids?

Qining Jin 1F
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

Re: C(v) and C(p)

Postby Qining Jin 1F » Fri Jan 19, 2018 10:33 am

Gasses have Cp and Cv (specific heats at constant pressure and volume), but I think solids and liquids only have one value for specific heat

Kelly Seto 2J
Posts: 30
Joined: Thu Jul 27, 2017 3:00 am

Re: C(v) and C(p)

Postby Kelly Seto 2J » Fri Jan 19, 2018 3:56 pm

Cp is greater than Cv because at constant volume, no work is being done so Cp is just equivalent to dU, but under constant pressure, expansion work takes place so you have to add the energy used for work (PdV) to dU

manasa933
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am

Re: C(v) and C(p)

Postby manasa933 » Fri Jan 19, 2018 6:47 pm

Do you mean Cv is equal to dU?


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