等号在可逆情况下成立,<ref>[http://scienceworld.wolfram.com/physics/ClausiusTheorem.html ''Clausius theorem''] at [[Wolfram Research]]</ref>严格不等号在不可逆情况下成立。可逆情况下引入状态函数熵。'''<font color="#32CD32">这是因为在循环过程中,状态功能的变化相对于状态功能为零。This is because in cyclic processes the variation of a state function is zero from state functionality.</font>'''
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等号在可逆情况下成立,<ref>[http://scienceworld.wolfram.com/physics/ClausiusTheorem.html ''Clausius theorem''] at Wolfram Research</ref>严格不等号在不可逆情况下成立。可逆情况下引入状态函数熵。'''<font color="#32CD32">这是因为在循环过程中,状态功能的变化相对于状态功能为零。This is because in cyclic processes the variation of a state function is zero from state functionality.</font>'''