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State whether the following is true or false.
Mixing hot and cold water at constant total energy generates entropy even though no energy is lost.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: A

The energy balance is satisfied exactly, yet the capacity of that energy to do work has fallen because the temperature difference has been destroyed. This is the clearest illustration of what the second law adds to the first.

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