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It implies the existence of a quantity called the entropy of a thermodynamic system. In terms of this quantity it implies that
 
It implies the existence of a quantity called the entropy of a thermodynamic system. In terms of this quantity it implies that
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这意味着热力学系统中存在一个叫做熵的量。了一个叫做热力学系统熵的量的存在。就这个数量而言,它意味着
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这意味着热力学系统中存在一个叫做熵的量。就这个数量而言,它意味着
    
{{quote|When two initially isolated systems in separate but nearby regions of space, each in [[thermodynamic equilibrium]] with itself but not necessarily with each other, are then allowed to interact, they will eventually reach a mutual thermodynamic equilibrium. The sum of the [[entropy|entropies]] of the initially isolated systems is less than or equal to the total entropy of the final combination. Equality occurs just when the two original systems have all their respective intensive variables (temperature, pressure) equal; then the final system also has the same values.}}<br>
 
{{quote|When two initially isolated systems in separate but nearby regions of space, each in [[thermodynamic equilibrium]] with itself but not necessarily with each other, are then allowed to interact, they will eventually reach a mutual thermodynamic equilibrium. The sum of the [[entropy|entropies]] of the initially isolated systems is less than or equal to the total entropy of the final combination. Equality occurs just when the two original systems have all their respective intensive variables (temperature, pressure) equal; then the final system also has the same values.}}<br>
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当只知道宏观状态时,熵也可以被看作是对系统运动和构型的微观细节有关的物理度量。这种细节通常在微观或分子尺度上被称为无序。该定律声称,对于一个系统的两个给定的宏观指定状态,它们之间存在一个被称为熵差的量。'''<font color="#32CD32">这种熵的差异定义了需要多少额外的微观物理信息来指定一个宏观指定状态,给定另一个宏观指定状态-通常是一个方便选择的参考状态,这可能是假定存在的,而不是明确陈述的。自然过程的最终条件始终包含着微观上特定的影响,而这些影响,从过程初始条件的宏观规定来看是无法被完全准确预测的。这就是为什么熵在自然过程中会增加——熵的增加告诉我们需要多少额外的微观信息来区分最终的宏观指定状态和最初的宏观指定状态。</font>'''
 
当只知道宏观状态时,熵也可以被看作是对系统运动和构型的微观细节有关的物理度量。这种细节通常在微观或分子尺度上被称为无序。该定律声称,对于一个系统的两个给定的宏观指定状态,它们之间存在一个被称为熵差的量。'''<font color="#32CD32">这种熵的差异定义了需要多少额外的微观物理信息来指定一个宏观指定状态,给定另一个宏观指定状态-通常是一个方便选择的参考状态,这可能是假定存在的,而不是明确陈述的。自然过程的最终条件始终包含着微观上特定的影响,而这些影响,从过程初始条件的宏观规定来看是无法被完全准确预测的。这就是为什么熵在自然过程中会增加——熵的增加告诉我们需要多少额外的微观信息来区分最终的宏观指定状态和最初的宏观指定状态。</font>'''
      
==Third law==
 
==Third law==
90

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