科研之友
微信
新浪微博
Facebook
分享链接
摘要
From Clausius%26apos;s principle, the entropy change in a closed system satisfies Delta S %26gt;= Sigma(k) Q(k)/T-k, where the equality holds for reversible processes and the inequality holds for irreversible processes. However, the entropy changes of infinite heat reservoirs are routinely calculated as Delta S = Q/T, independently of the nature of the heat exchange, whether reversible or irreversible. We show how this result comes about by considering the direct thermal contact between two systems, and then by allowing one of them to be much larger than the other. We then re-examine the usual definition of reversibility to reconcile it with the expression found for the entropy change.
- 出版日期2013-5
