Constant Pressure


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Victoria Zheng--2F
Posts: 103
Joined: Fri Aug 09, 2019 12:17 am

Constant Pressure

Postby Victoria Zheng--2F » Thu Feb 06, 2020 6:51 pm

Hello. I don't quite understand what is the meaning of there is no expansion work done when the pressure is constant?

Rachel Yu 1G
Posts: 113
Joined: Fri Aug 09, 2019 12:15 am

Re: Constant Pressure

Postby Rachel Yu 1G » Thu Feb 06, 2020 8:24 pm

Do you mean no expansion work done when the volume is constant? Since w= -PdeltaV, no change in volume makes deltaV (and therefore w) equal to 0.

Jessica Li 4F
Posts: 115
Joined: Fri Aug 09, 2019 12:16 am

Re: Constant Pressure

Postby Jessica Li 4F » Thu Feb 06, 2020 9:41 pm

When pressure is constant, there is expansion work done, which can be calculated using the equation w = -P(deltaV). However, at constant volume, delta V is 0, so w will be 0 and no work will be done.

205291012
Posts: 50
Joined: Mon Nov 11, 2019 12:17 am

Re: Constant Pressure

Postby 205291012 » Thu Feb 06, 2020 9:57 pm

There is no expansion work done at constant volume. This is because for expansion work to be done the piston needs to move from a lower volume to a higher volume.

There is expansion work done at constant pressure.


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