版权所有：华东理工大学物理化学教研室 11 The entropy of an isolated system increases in the course of a spontaneous change: In the term of entropy ΔStot > 0 where Stot is the total entropy of the system and its surroundings. Thermodynamically irreversible processes are spontaneous processes, and must be accompanied by an increase in entropy. 4.1 The dispersal of energy The direction of spontaneous change版权所有：华东理工大学物理化学教研室 11 The entropy of an isolated system increases in the course of a spontaneous change: In the term of entropy ΔStot > 0 where Stot is the total entropy of the system and its surroundings. Thermodynamically irreversible processes are spontaneous processes, and must be accompanied by an increase in entropy. 4.1 The dispersal of energy The direction of spontaneous change