About entropy at T=0


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Lizzie Zhang 2C
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

About entropy at T=0

Postby Lizzie Zhang 2C » Sun Jan 28, 2018 9:19 pm

It says in the book section 9.7, S(T)=S(0)+deltaS(heating from 0 to T)=deltaS(heating from 0 to T)
Why it can be equaled that way? Since S(0) is only 0 for perfect crystals at T=0?
If it's not a perfect zero, wouldn't S(0) be some number due to the positional entropy?

Emily Oren 3C
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: About entropy at T=0

Postby Emily Oren 3C » Sun Jan 28, 2018 9:51 pm

I think that either this equation is assuming that the substance is a perfect crystal or that it is an approximation and that the positional entropy of the substance at 0K is negligible when compared with the deltaS term.

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