How does the second law of thermodynamics disprove all perpetual motion machines?
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because a perpetual machine can decrease overall entropy which is forbiden by the second law. – Jan 17 '19 at 03:41
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2Possible duplicate of How does the second law of thermodynamics forbid the possibility of perpetual machine of the second kind? – GodotMisogi Jan 17 '19 at 04:26