molar heat capacity of a gas

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Liam Maxwell 2E
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

molar heat capacity of a gas

Postby Liam Maxwell 2E » Sun Jan 14, 2018 9:35 pm

Why do gasses have two different values for the molar heat capacity as opposed to solids and liquids only having one?

Ashin_Jose_1H
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Re: molar heat capacity of a gas

Postby Ashin_Jose_1H » Sun Jan 14, 2018 9:57 pm

I think you are referring to Cv and Cp.
Cv is the proportionality between the heat supplied to a system and the temperature rise under constant volume and Cp is the same thing under constant pressure.
Gas can be compressed to create a difference in pressure and volume. Under constant pressure, some of the heat supplied to a gas may be used to create a difference in Volume and vice versa. Solids and Liquids are basically incompressible, so Cv and Cp for a solid would be the same. So we just call it C.


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