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Latest answer · Physics
"Why does entropy always increase?"
STEP 1The second law states that for an isolated system, ΔS_total ≥ 0.
STEP 2Entropy measures the number of microstates: S = k ln W.
STEP 3Systems spontaneously evolve toward higher-probability macrostates, which have more microstates.
STEP 4Hence W — and S — never decrease for an isolated system.
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