热力学中的过程函数(英语:process function)是指描述系统状态变化过程的物理量。像等都是过程函数。

过程函数不只是和起初和最终的状态有关,过程函数也和中间经过的路径有关,此特性和状态函数不同,状态函数的数值只和起初和最终的状态有关,和中间的路径无关。

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