ELI5-What is entropy?
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In your childhood home your bedroom has the air conditioner vents open. Your brother in his room has the vents close. There is a door between your two rooms which is shut. The AC system then gives out and stops working
At this point the cold air is in your room and the hot air in your brother’s room. The hot and cold air are orderly separated. The door between your rooms is opened.
Initially your room is still very cold and your brother’s hot. But over time the hot air comes into your room and the cold air goes to brother’s room. The mix of cold air/hot air increases over time.
It does not go back (on its own) to having all the hot air in one room and the cold air in another. This is entropy.
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