餘熵者,熵之在絕對零度下者也。夫熵,亂度也。熱力學第三定律嘗云︰「絕對零度下,無有熵矣。」蓋因諸物於斯,幾盡為完美晶體。
然則餘熵者,豈不怪哉?非也。實因凡事難知,異見常有。凡基態不一,卻同乎零點能量者(亦云無有完美晶體,且粒子莫之能一者),悉有餘熵矣,如一氧化碳。
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