Discussion
The entropy of an isolated system or universe always:
Answer: A
The entropy of an isolated system or the universe increases.
This is the principle of increase of entropy, a statement of the second law: for an isolated system \(\Delta S \geq 0\), with equality only for an ideal reversible process. Every real process is irreversible, so the entropy of the universe always increases.
A decrease would violate the second law. Remaining constant holds only in the reversible limit, which real processes never reach, and the entropy is not zero.
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