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The second law of thermodynamics states that the entropy of the universe always increases in a spontaneous process. Entropy is a measure of the disorder or randomness of a system. A system with high entropy has many possible configurations or microstates, while a system with low entropy has few possible configurations or microstates. The inequality ΔS ≥ 0 means that the change in entropy of the universe is always greater than or equal to zero for any process. This implies that the entropy of the universe can never decrease, and that it will reach a maximum value when the system and its surroundings are in thermal equilibrium. Here're a few implications of the law, > Heat cannot flow spontaneously from a colder body to a warmer body, because that would decrease the entropy of the universe. > A heat engine cannot convert all the heat supplied to it into work, because some heat must be rejected to the surroundings to increase their entropy. The efficiency of a heat engine is limited by the Carnot efficiency, which depends on the temperature difference between the heat source and the heat sink. > A perpetual motion machine of the second kind, which is a device that can produce work without any input of energy or matter, is impossible, because it would violate the second law of thermodynamics by decreasing the entropy of the universe.