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系综的一种特殊情况是不随时间演化的系综。这样的系综称为<font color="#FF8000">平衡系综 equilibrium ensembles</font>，它们的状态称为<font color="#FF8000">统计平衡 statistical equilibrium</font>。如果对于系综中的每个状态，系综也包含其所有的未来和过去的状态，并且其概率等于处于该状态的概率，则出现统计平衡。孤立系统的平衡系综是统计热力学研究的重点。非平衡统计力学研究更一般的情况下的可以随时间演化的系综，以及（或）非孤立系统的系综。

系综的一种特殊情况是不随时间演化的系综。这样的系综称为<font color="#FF8000">平衡系综 equilibrium ensembles</font>，它们的状态称为<font color="#FF8000">统计平衡 statistical equilibrium</font>。如果对于系综中的每个状态，系综也包含其所有的未来和过去的状态，并且其概率等于处于该状态的概率，则出现统计平衡。孤立系统的平衡系综是统计热力学研究的重点。非平衡统计力学研究更一般的情况下的可以随时间演化的系综，以及（或）非孤立系统的系综。

== Statistical thermodynamics ==

== Statistical thermodynamics 统计热力学==

 

The primary goal of statistical thermodynamics (also known as equilibrium statistical mechanics) is to derive the [[classical thermodynamics]] of materials in terms of the properties of their constituent particles and the interactions between them. In other words, statistical thermodynamics provides a connection between the macroscopic properties of materials in [[thermodynamic equilibrium]], and the microscopic behaviours and motions occurring inside the material.

The primary goal of statistical thermodynamics (also known as equilibrium statistical mechanics) is to derive the [[classical thermodynamics]] of materials in terms of the properties of their constituent particles and the interactions between them. In other words, statistical thermodynamics provides a connection between the macroscopic properties of materials in [[thermodynamic equilibrium]], and the microscopic behaviours and motions occurring inside the material.