热力学平衡

热力学系统的平衡定义为热力学系统诸属性不随时间变化。通常而言，系统平衡时要比未平衡时容易研究得多。通常在研究一个热力学过程时，可以假设每个中间过程中，系统处于平衡态。这样可以大大简化对于系统的研究分析。 对于可逆过程，其每一阶段也必须是可逆的。而一个过程的可逆阶段中，系统必须时时处于平衡。而这在现实中不能达到，只能通过使过程缓慢进行来趋近，因为过程中的每一阶段在没有打破系统平衡的前提下是不能进行的。

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