$\Delta U=q+w$

Hena Sihota 1L
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am
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The following equation was given in lecture today: DeltaU=energy transferred by heating (+q) + energy transferred by compression (+w)
If the system was cooled instead of heated you would just replace "heating (+q)" with "cooling (-q)" and if the system was expanded instead of compressed you would just replace "compression (+w)" with "expansion (-w)". Is that correct?

Jeremiah Samaniego 2C
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

Re: Clarification About DeltaU=q+w

I believe so. If a system is being cooled, then heat would be leaving the system (-q) and if the system is expanding, then work is being done by the system (-w).

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