What is the entropy criterion for spontaneous change in an isolated system?

since we are facing a closed system the entropy of the serious system 0 in any situation

Explanation:

This is because as it is a closed system there will be no energy exchange between the system and the environment that surrounds it, therefore the reactions that occur spontaneously or not spontaneously will not take or dissipate energy to the medium. Therefore, the energy exchange will be null, equivalent to zero.

A clear example of this is the heating of water in absolute isolation systems such as thermoses that maintain the temperature and prevent heat from being transmitted through its walls, isolating hot water by keeping it at the same temperature for hours.

the body's situation won't change the forces are equal opposit and on the same body