The Second Law of Thermodynamics
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State
The second law: for a spontaneous process, total entropy of system plus surroundings always increases.
Show
A freezing puddle loses entropy as it orders into ice, but the air gains more entropy from the released heat, so the total rises.
Watch for
A system's own entropy can fall — the law bounds the system-plus-surroundings total, not the system alone.
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- Nothing yet depends on this.