Third law of thermodynamics: Difference between revisions

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|Meaning=The statement that every substance has a finite positive [[entropy]],  and the entropy of a crystalline substance is zero at the [[temperature]] of [[absolute zero]].
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|Explanation=Modern [[quantum theory]] has shown that the entropy of crystals at 0 K is not necessarily zero.  If the [[crystal]] has any asymmetry, it may exist in more than one state; and there is, in addition,  an entropy residue deriving from nuclear spin. <br/>''See'' [[thermodynamic probability]].
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== third law of thermodynamics ==
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<div class="definition"><div class="short_definition">The statement that every substance has a finite positive [[entropy]],  and the entropy of a crystalline substance is zero at the [[temperature]] of [[absolute zero]].</div><br/> <div class="paragraph">Modern [[quantum theory]] has shown that the entropy of crystals at 0 K is not necessarily zero.  If the [[crystal]] has any asymmetry, it may exist in more than one state; and there is, in addition,  an entropy residue deriving from nuclear spin. <br/>''See'' [[thermodynamic probability]].</div><br/> </div>
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Latest revision as of 11:46, 28 March 2024

The statement that every substance has a finite positive entropy, and the entropy of a crystalline substance is zero at the temperature of absolute zero.

Modern quantum theory has shown that the entropy of crystals at 0 K is not necessarily zero. If the crystal has any asymmetry, it may exist in more than one state; and there is, in addition, an entropy residue deriving from nuclear spin.
See thermodynamic probability.

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