When to use Cv and Cp with entropy

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Kyra LeRoy 1E
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Joined: Sat Jul 22, 2017 3:00 am

When to use Cv and Cp with entropy

Postby Kyra LeRoy 1E » Sat Feb 10, 2018 5:58 pm

Can someone explain in which situations we use Cv and Cp? I think I remember my TA saying with entropy Cv is actually used when the volume and temperature are changing, but I don't know if I heard that correctly, since last chapter we used it when the volume was constant.

Nhan Nguyen 2F
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Joined: Thu Jul 13, 2017 3:00 am
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Re: When to use Cv and Cp with entropy

Postby Nhan Nguyen 2F » Sat Feb 10, 2018 6:10 pm

For Temperature-dependence entropy,
Cv is used when there is constant volume and changing temperature and the equation you would use is: ΔS = n(Cm,v)ln(T2/T1)
Cp is used for constant pressure and changing temperature and the equation you'd use is: ΔS = n(Cm,p)ln(T2/T1)


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