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In a system that is in its own state of internal thermodynamic equilibrium, no macroscopic change occurs.  

In a system that is in its own state of internal thermodynamic equilibrium, no macroscopic change occurs.  

Systems in mutual thermodynamic equilibrium are simultaneously in mutual thermal, mechanical, chemical, and radiative equilibria. Systems can be in one kind of mutual equilibrium, though not in others. In thermodynamic equilibrium, all kinds of equilibrium hold at once and indefinitely, until disturbed by a thermodynamic operation. In a macroscopic equilibrium, perfectly or almost perfectly balanced microscopic exchanges occur; this is the physical explanation of the notion of macroscopic equilibrium.  

Systems in mutual thermodynamic equilibrium are simultaneously in mutual thermal, mechanical, chemical, and radiative equilibria. Systems can be in one kind of mutual equilibrium, though not in others. In thermodynamic equilibrium, all kinds of equilibrium hold at once and indefinitely, until disturbed by a thermodynamic operation. In a macroscopic equilibrium, perfectly or almost perfectly balanced microscopic exchanges occur; this is the physical explanation of the notion of macroscopic equilibrium.  

互热力学平衡体系同时处于热平衡、机械平衡、化学平衡和辐射平衡。系统可以处于一种相互平衡状态，但不能处于另一种相互平衡状态。在21热力学平衡，所有的平衡同时并且无限期地保持着，直到被热力学操作打破。在一个宏观平衡中，完全或几乎完全平衡的微观交换发生了; 这是对宏观平衡概念的物理解释。

互热力学平衡体系同时处于'''<font color="#ff8000">热 Thermal</font>'''平衡、'''<font color="#ff8000">机械 Mechanical</font>'''平衡、化'''<font color="#ff8000">化学 Chemical</font>'''平衡和'''<font color="#ff8000">辐射 Radiative</font>'''平衡。系统可以处于一种相互平衡状态，但不能处于另一种相互平衡状态。在21热力学平衡，所有的平衡同时并且无限期地保持着，直到被热力学操作打破。在一个宏观平衡中，完全或几乎完全平衡的微观交换发生了; 这是对宏观平衡概念的物理解释。