The statement that "heat energy cannot be completely transformed into work" is a statement of which thermodynamic law?

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The statement that "heat energy cannot be completely transformed into work" is a restatement of the Second Law of Thermodynamics. This law essentially states that in any cyclic process, the entropy of the system will either increase or remain the same. It implies that perfect efficiency in energy conversion is impossible, as some energy will always be lost as waste heat.

The Statement That "Heat Energy Cannot Be Completely Transformed into Work