Spontaneousness of Thermodynamic equilibrium
Due to some external action, when the system is in an unbalanced state, there is an unbalanced potential difference between the parts. As long as there is no constraint, no external action is required, and the state of the system will also be affected by the interaction between the parts It changes until it reaches equilibrium again. Therefore, if the system is originally in a balanced state, its state will not change if there is no external effect; but if the system is in an unbalanced state, its state will change even if there is no external function. . All systems will spontaneously move towards equilibrium, which is a universal law in nature.