Imagine you tidy up your room, over time it gets messy. It will never go back to it’s initial tidy state on it’s own. It will always get more messy. So you have to clean it to bring it back to its tidy state.
Same applies to physical systems. Assume you have a perfectly ordered system, over time, it loses it’s order slowly. It will never move itself back to the perfectly ordered state. It will always drift towards no order.
That’s entropy.
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