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Micro and macro internal energy approach

Thread starter aviatorx
Start date Oct 19, 2010
Tags

Approach Energy Internal Internal energy Micro

2 replies · 3K views · last reply Oct 20, 2010

aviatorx

Thread starter
Oct 19, 2010

#1

Slide titled "Definition of a state in terms of energy" showing a blue box of gas particles between U=U(P,V,T) with PVT system, macroscopic approach, and U=Σ(ek_i+ep_i) with NVU system, microscopic approach, linked by a double arrow labeled equivalent; bottom text reads BUT: Internal energy (U) is not sufficient to compare states.

Why is internal energy not sufficient to compare states?

Thank you for your answer.

Discussion

Nejklc

Oct 19, 2010

#2

I think it has to do something with free energy, but I can't remember now. I hope someone else knows!
Regards

aviatorx

Oct 20, 2010

#3

It's a difficult question... I have been searching for 3 hours and found nothing :(

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