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### Cp and Cv

Posted: Wed Feb 05, 2020 10:07 pm
Can someone explain what is Cp and Cv? What is their relationship? Are there any equation that has Cp and Cv in it?

### Re: Cp and Cv

Posted: Wed Feb 05, 2020 11:22 pm
The subscript describes the conditions: Cp is for constant pressure, Cv is for constant volume.

### Re: Cp and Cv

Posted: Wed Feb 05, 2020 11:35 pm
For an ideal gas, Cp,m=Cv,m + R
Cp,m is the molar heat capacity at a constant pressure
Cv,m is the molar heat capacity at a constant volume
R is the gas constant

### Re: Cp and Cv

Posted: Wed Feb 05, 2020 11:47 pm
Where would m*C*delta T be in this situation?

### Re: Cp and Cv

Posted: Thu Feb 06, 2020 11:20 am
Cp is the heat capacity at constant pressure. Cv is the heat capacity at constant volume. According to PV = nRT, if temperature is changing, that means one other variable also has to change and this could be number of moles, pressure, or volume. It is important to know which ones are constant when calculating heat capacity.