等压过程的组合仍是等压过程

摘要

等压过程是指环境压力恒定不变而系统的始态压力和终态压力相等并等于环境压力的过程。在封闭系统中,多个等压过程的组合仍然是等压过程。如果在封闭系统与环境之间没有非体积功交换,则在组合的等压过程中整个系统的热效应等于系统的焓变。吉布斯函数最低原理和相平衡规则对于一定温度下无非体积功的组合等压过程也是适用的。%The combination of isobaric processes is still isobaric process.If there is no non-volume work,the thermal effect of the combined isobaric process is equal to the enthalpy change of the system.For the isothermal combined isobaric process,if there is no non-volume work,the minimum principle of Gibbs function and the phase equilibrium criterion are still applicable.