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Such states are a principal concern in what is known as classical or equilibrium thermodynamics, for they are the only states of the system that are regarded as well defined in that subject. A system in contact equilibrium with another system can by a thermodynamic operation be isolated, and upon the event of isolation, no change occurs in it. A system in a relation of contact equilibrium with another system may thus also be regarded as being in its own state of internal thermodynamic equilibrium.

Such states are a principal concern in what is known as classical or equilibrium thermodynamics, for they are the only states of the system that are regarded as well defined in that subject. A system in contact equilibrium with another system can by a thermodynamic operation be isolated, and upon the event of isolation, no change occurs in it. A system in a relation of contact equilibrium with another system may thus also be regarded as being in its own state of internal thermodynamic equilibrium.

这种状态是所谓的经典热力学或平衡态热力学的主要关注点，因为它们是系统中被认为在这门学科中得到很好定义的唯一状态。一个与另一个系统处于接触平衡状态可以被一个'''<font color="#ff8000">热力学操作 Thermodynamic Operation</font>'''隔离，在隔离发生时，其内部不会发生任何变化。因此，一个与另一个系统处于接触平衡状态时也可以被视为处于其自身的内部热力学平衡状态。

这种状态是所谓的经典热力学或平衡态热力学的主要关注点，因为它们是系统中被认为在这门学科中得到很好定义的唯一状态。一个与另一个系统处于接触平衡状态可以被一个'''<font color="#ff8000">热力运行 Thermodynamic Operation</font>'''隔离，在隔离发生时，其内部不会发生任何变化。因此，一个与另一个系统处于接触平衡状态时也可以被视为处于其自身的内部热力学平衡状态。

==Multiple contact equilibrium==

==Multiple contact equilibrium==