samedi 5 septembre 2015

Entropy of a system as universe expands

I just encountered this problem in my EK book and am a bit confused:
All of the following are examples of processes which increase system entropy EXCEPT:

A. the expanding universe
B. aerobic respiration
C. melting ice
D. building a bridge

I initially said D (which is correct) but then I saw that the question specified entropy of a system so I put A. My reasoning was that the expanding universe would increase the entropy of the universe and not the system and figured it might have been one...

Entropy of a system as universe expands

Entropy of a system as universe expands

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