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In the special case of a reversible process, the equality holds. The reversible case is used to introduce the state function known as entropy. This is because in a cyclic process the variation of a state function is zero. In other words, the Clausius statement states that it is impossible to construct a device whose sole effect is the transfer of heat from a cool reservoir to a hot reservoir. Equivalently, heat spontaneously flows from a hot body to a cooler one, not the other way around.  

In the special case of a reversible process, the equality holds. The reversible case is used to introduce the state function known as entropy. This is because in a cyclic process the variation of a state function is zero. In other words, the Clausius statement states that it is impossible to construct a device whose sole effect is the transfer of heat from a cool reservoir to a hot reservoir. Equivalently, heat spontaneously flows from a hot body to a cooler one, not the other way around.  

当在过程可逆的特殊情况下，该等式成立。其可逆过程可用于引入'''<font color="#ff8000"> 熵Entropy </font>''' '''<font color="#ff8000"> 状态函数State function </font>'''。这是因为在循环过程中，状态函数的变化为零。换句话说，'''<font color="#ff8000"> 克劳修斯表述Clausius statement</font>'''指出，不可能构造出一种装置，使其仅仅将热从低温热库传递至高温热库而不引起其他变化。相当于说，热量只能自发地从高温物体流向相对低温的物体，反向则不行。

当在过程可逆的特殊情况下，该等式成立。其可逆过程可用于引入'''<font color="#ff8000"> 熵Entropy </font>'''的 '''<font color="#ff8000"> 状态函数State function </font>'''。这是因为在循环过程中，状态函数的变化为零。换句话说，'''<font color="#ff8000"> 克劳修斯表述Clausius statement</font>'''指出，不可能构造出一种装置，使其仅仅将热从低温热库传递至高温热库而不引起其他变化。相当于说，热量只能自发地从高温物体流向相对低温的物体，反向则不行。