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Topic: Reversible isothermal expansion  (Read 3226 times)

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Offline manypostcards

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Reversible isothermal expansion
« on: September 14, 2012, 12:11:34 AM »
For the second step in the problem below, which is a reversible isothermal expansion, how does one conclude to take the natural log of (Pi/Pf) in place of (Vf/Vi)? I've been at it for 40 minutes now. Thanks.

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Offline curiouscat

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Re: Reversible isothermal expansion
« Reply #1 on: September 14, 2012, 12:53:51 AM »
Ideal Gas

PV=nRT

Isothermal, hence T=const.

PiVi=PfVf

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Offline manypostcards

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Re: Reversible isothermal expansion
« Reply #2 on: September 14, 2012, 02:53:25 PM »
Damn that's mindblowing, thank you. I'll have to reread the chapter to find out why you can just do that though.
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Offline curiouscat

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Re: Reversible isothermal expansion
« Reply #3 on: September 14, 2012, 03:03:20 PM »
Quote from: manypostcards on September 14, 2012, 02:53:25 PM
I'll have to reread the chapter to find out why you can just do that though.

Didn't get you.
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