when to use...?


and

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connie 2C
Posts: 106
Joined: Thu Jul 11, 2019 12:17 am

when to use...?

Postby connie 2C » Mon Feb 03, 2020 10:42 pm

when do you use each equation and how do you know when to use it?

ALegala_2I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: when to use...?

Postby ALegala_2I » Tue Feb 04, 2020 8:29 am

You use w=-PV when there is an expansion occurring at a constant external pressure. You use the other equation when there is a change in internal and external pressure for expansion work.

Elizabeth Harty 1A
Posts: 125
Joined: Sat Jul 20, 2019 12:16 am

Re: when to use...?

Postby Elizabeth Harty 1A » Tue Feb 04, 2020 8:49 am

You use the ln one when the pressure is not constant.

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: when to use...?

Postby 805097738 » Tue Feb 04, 2020 12:59 pm

ALegala_2I wrote:You use w=-PV when there is an expansion occurring at a constant external pressure. You use the other equation when there is a change in internal and external pressure for expansion work.


what is the other equation?

Izzie Capra 2E
Posts: 103
Joined: Sat Sep 07, 2019 12:19 am

Re: when to use...?

Postby Izzie Capra 2E » Tue Feb 04, 2020 2:25 pm

I think the other equation is w= -nRTln(V2/V1). Use this when work is being done at a non-constant pressure.


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