thermodynamicsentropy~5 min read
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Thermodynamics and the Arrow of Time
Why disorder always increases — and what that means for the universe
The second law of thermodynamics may be the most profound law in all of physics.
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The second law of thermodynamics states that entropy (disorder) in an isolated system always increases. This gives time its direction: you can scramble an egg but not unscramble it. Stars, galaxies, and even the universe itself will eventually reach maximum entropy — 'heat death' — where no useful energy remains.
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