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Physics · L3 · The Laws of Thermodynamics & Heat Engines · flowchart

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🔥 Hot object next to a cold objectHeat flows spontaneously hot → coldEntropy of the system increasesEventually reach thermal equilibriumReverse this on its own?❌ Would require entropy to decrease✅ Possible, e.g. a refrigeratorNever spontaneouslyOnly with external work

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