Isothermal pressure change

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Samantha Joseph 1F
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Joined: Fri Sep 29, 2017 7:04 am
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Isothermal pressure change

Postby Samantha Joseph 1F » Sat Feb 03, 2018 11:03 pm

Why is it that the equation for finding the entropy of a system with an isothermal pressure change uses P1/P2 when temperature and volume are typically T2/T1 or V2/V1?

Ju-Wei Wang 1I
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Joined: Fri Sep 29, 2017 7:05 am

Re: Isothermal pressure change

Postby Ju-Wei Wang 1I » Sat Feb 03, 2018 11:05 pm

According to the ideal gas law, specifically Boyle's Law, pressure is inversely related to volume, so at constant temperature, V2/V1=P1/P2.

Matthew 1C
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Joined: Fri Sep 29, 2017 7:06 am

Re: Isothermal pressure change

Postby Matthew 1C » Sat Feb 03, 2018 11:08 pm

I think the reason P1/P2 is used is because it is inversely proportional to volume, which uses V2/V1. Also since both pressure and volume are directly proportional to temperature, does it matter which one uses 1/2 or 2/1?

Ashley Macabasco 2K
Posts: 30
Joined: Fri Sep 29, 2017 7:05 am

Re: Isothermal pressure change

Postby Ashley Macabasco 2K » Sun Feb 04, 2018 1:33 am

The change in pressure equation is P1/P2 opposed to P2/P1 like for the change in temperature and the change in volume because of Boyle's law in which volume and pressure are inversely proportional.


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