2026-09-04 12:31:07: Physics 2

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+[[Thermodynamics]]
+# Summary
+* Entropy describes energy's tendency to spread out and cause some of the energy to become useless.
+* Entropy decreases when energy is organized, increases when spread out.
+* Higher entropy means more useless energy.
+* Total entropy of an isolated system never decreases over time.
+* Entropy remains constant only in perfectly reversible processes (theoretical).
+* IRL, entropy always increases.