delta u sign

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Sahand Fardi 1
Posts: 19
Joined: Wed Sep 21, 2016 2:56 pm

delta u sign

Postby Sahand Fardi 1 » Sun Jan 22, 2017 9:06 pm

for the delta u equation that states delta u= delta h-p(delta v), does the sign in the middle become plus when there is work being done on the system? Or, is it always minus regardless of work done on or given off?

Azeel_Mohammed_1C
Posts: 10
Joined: Wed Nov 18, 2015 3:00 am

Re: delta u sign

Postby Azeel_Mohammed_1C » Sun Jan 22, 2017 9:22 pm

Yes, from what I know, it does become a positive when work is being done on the system.

Josephine_Tang_1N
Posts: 30
Joined: Wed Sep 21, 2016 2:57 pm

Re: delta u sign

Postby Josephine_Tang_1N » Mon Jan 23, 2017 12:42 am

Right - this is since the volume decreases (negative V) and corresponds to a change from: - PV to + PV.


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