巧用设计途径法求算不可逆相变过程的状态函数增量

Using skillfully "the design path"to solve the increment of the state function in the course of irreversible phase transition

等温等压不可逆相变过程和非等温等压不可逆相变过程状态函数增量可以通过设计途径法求算 ,所设途径中包含有与已知相变焓相应的可逆相变过程 .在标准压力下 ,通过改变温度设计途径 ;在一定温度下 。

The increment of the state function in the course of irreversible phase transition which is isothermal and isopressor or not can be solved by 'the design path'.The designed path contains the reversible phase transition which corresponds to the known enthalph of phase transition.On the criterion pressure,the path is designed by changing temperature;on the constant temperature,the path is designed by changing pressure.