Answer :
Final answer:
The second law of thermodynamics explains the direction of heat transfer and the increase of entropy in systems.
Explanation:
The second law of thermodynamics states that the total entropy of a system either increases or remains constant in any spontaneous process; it never decreases. This law implies that heat transfers energy spontaneously from higher- to lower-temperature objects, but never in the reverse direction.
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La afirmación correcta sobre la segunda ley de la termodinám es b) Afirma que la entropía de un sistema aislado siempre tiende a aumentar con el tiempo.