ELI5-What is entropy?
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Entropy is a measure of the number of ways in which a system can exists. The most intuitive example (to me) is a solid versus a gas. In a solid, the molecules (or atoms) are held rigidly in place with little ability to move around. In a gas, the molecules (or atoms) can freely fly around in space and can move all over the place. So the gas has more entropy because the molecules that make up that gas can exist in space in more ways by moving around freely.
Admittedly, this isn’t the best ELI5 explanation, but I hope it helps.
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