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Topic: absolute 0 for entropy  (Read 5361 times)

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Offline rleung

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absolute 0 for entropy
« on: August 15, 2006, 03:11:25 AM »
Hi,

I'm wondering whether you can consider the 0 entropy that is present in a perfect crystal at 0-K absolute zero?  I always thought that that was absolute zero for entropy, but another chemistry review book says that absolute zero doesn't exist for it.  Thanks.

Ryan
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Offline xiankai

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Re: absolute 0 for entropy
« Reply #1 on: August 15, 2006, 09:21:51 AM »
maybe what the book is trying to say that a perfect crystal at absolute zero does not exist? not sure..
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Offline Donaldson Tan

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Re: absolute 0 for entropy
« Reply #2 on: September 02, 2006, 09:55:53 PM »
Considering classical system, there is indeed an absolute zero for entropy. However, if you were to take in account of the quantum mechanics, then you would realise that even the zero-point energy of the system is non-zero. Heisenberg Uncertainty Principle requires there is variation of energy level of the quantum states even at 0K.
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Offline Hispania

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Re: absolute 0 for entropy
« Reply #3 on: September 03, 2006, 03:42:52 PM »
Quote from: rleung on August 15, 2006, 03:11:25 AM
I'm wondering whether you can consider the 0 entropy that is present in a perfect crystal at 0-K absolute zero?  I always thought that that was absolute zero for entropy, but another chemistry review book says that absolute zero doesn't exist for it. 

The 0 K (-273 ºC or absolute zero) is impossible to approach. So I imagine that 0 entropy is imposible as well.
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