it expresses the criterion for natural, spontaneous change solely in terms of the properties of the system From now on the superscript denoting the system will be dropped, and everything we do will relate to the system The last equation can be developed in two ways 4上一内容下一内容◇回主目录 返回 2021/2/21上一内容 下一内容 回主目录 返回 2021/2/21 it expresses the criterion for natural,spontaneous change solely in terms of the properties of the system. From now on the superscript denoting the system will be dropped, and everything we do will relate to the system. The last equation can be developed in two ways