更改

The equality sign holds in the case that only reversible processes take place inside the system. If irreversible processes take place (which is the case in real systems in operation) the >-sign holds.  If heat is supplied to the system at several places we have to take the algebraic sum of the corresponding terms.

The equality sign holds in the case that only reversible processes take place inside the system. If irreversible processes take place (which is the case in real systems in operation) the >-sign holds.  If heat is supplied to the system at several places we have to take the algebraic sum of the corresponding terms.

<font color = 'red'><s>等式符号在只有可逆过程在系统内发生的情况下成立。</s></font><font color = 'blue'>只有在系统内发生可逆过程的情况下等号才成立</font>如果发生不可逆过程<font color = 'red'><s>(</s></font><font color = 'blue'>（</font>在实际操作系统中就是这种情况）,<font color = 'red'><s>符号保持不变</font><font color = 'blue'>则“＞”成立。如果系统有多处供热，必须求相应项的代数和。

<font color = 'red'><s>等式符号在只有可逆过程在系统内发生的情况下成立。</s></font><font color = 'blue'>只有在系统内发生可逆过程的情况下等号才成立</font>如果发生不可逆过程<font color = 'red'><s>(</s></font><font color = 'blue'>（</font>在实际操作系统中就是这种情况）,<font color = 'red'><s>符号保持不变</s></font><font color = 'blue'>则“＞”成立。如果系统有多处供热，必须求相应项的代数和。

   --[[用户:嘉树|嘉树]]（[[用户讨论:嘉树|讨论]]） 因为是中文环境所以统一用中文标点

   --[[用户:嘉树|嘉树]]（[[用户讨论:嘉树|讨论]]） 因为是中文环境所以统一用中文标点