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Thermodynamic equilibrium is an axiomatic concept of thermodynamics. It is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable walls. In thermodynamic equilibrium there are no net macroscopic flows of matter or of energy, either within a system or between systems.  

Thermodynamic equilibrium is an axiomatic concept of thermodynamics. It is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable walls. In thermodynamic equilibrium there are no net macroscopic flows of matter or of energy, either within a system or between systems.  

'''热力学平衡'''是'''<font color="#ff8000">热力学 Thermodynamics</font>'''的一个'''<font color="#ff8000">不言自明的 Axiomatic</font>'''概念。它是单个热力学系统的内部状态，或者是几个热力学系统之间通过或多或少的渗透或不渗透的墙连接的关系。在21热力学平衡，不存在物质或能量的净宏观流动，无论是在一个系统内还是在系统之间。

'''热力学平衡'''是'''<font color="#ff8000">热力学 Thermodynamics</font>'''的一个'''<font color="#ff8000">不言自明的 Axiomatic</font>'''概念。它是单个'''<font color="#ff8000">热力学系统 Thermodynamic System</font>'''的内部'''<font color="#ff8000">状态 State</font>'''，或者是几个热力学系统之间通过或多或少的渗透或不渗透的'''<font color="#ff8000">墙 Wall</font>'''连接的关系。在热力学平衡中不存在'''<font color="#ff8000">物质 Matter</font>'''或'''<font color="#ff8000">能量 Energy</font>'''的净'''<font color="#ff8000">宏观 Macroscopic</font>''''''<font color="#ff8000">流动 Flow</font>'''，无论是在一个系统内还是在系统之间。