Question

Behavior of maximum entropy states in a closed system?

Answer 1

Following the second law of thermodynamics, entropy of an isolated system always increasesfor irreversible processes. The difference between an isolatedsystem and closed system is that heat may not flow to and from an isolated system, but heat flow to and from a closed system ispossible.

Answer 2

Entropy always increases (or at best, stays constant) in a closed system. It does not matter what the system is made of; matter, antimatter, light, whatever. Loosely speaking, entropy is a measure of disorder in a system; left to its own, every system heads from more orderly (i.e., less probable) configurations to less ordered (more probable) configurations.

In a system that's not closed, entropy can decrease.