constant pressure and constant volume

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Jasmine Botello 2F
Posts: 67
Joined: Fri Sep 29, 2017 7:04 am

constant pressure and constant volume

Postby Jasmine Botello 2F » Tue Feb 06, 2018 10:29 am

I am very confused because I am doing problems in which some say constant volume = 5/2R and others say constant pressure is 5/2R. Isn't one of these supposed to be 3/2R??

Jingyi Li 2C
Posts: 56
Joined: Fri Sep 29, 2017 7:06 am

Re: constant pressure and constant volume

Postby Jingyi Li 2C » Tue Feb 06, 2018 10:38 am

For ideal gases's specific heat capacity:
At constant volume:
monatomic gas: 3/2R
diatomic gas: 5/2R

At constant pressure (=Cv+R):
monatomic gas: 5/2R
diatomic gas: 7/2R

Nehal Banik
Posts: 64
Joined: Thu Jul 13, 2017 3:00 am

Re: constant pressure and constant volume

Postby Nehal Banik » Tue Feb 06, 2018 11:29 am

It depends what the question is going to be asking, but if it asks for an ideal gas the CV is 3/2R and the CP is 5/2R, or at least that's what my TA told me.

Brigitte Phung 1F
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am
Been upvoted: 1 time

Re: constant pressure and constant volume

Postby Brigitte Phung 1F » Tue Feb 06, 2018 1:28 pm

For monatomic ideal gasses, at constant volume Cv = (3/2)R and at constant pressure Cp = (5/2)R.


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