Discussion
Consider the following statements about entropy.
1. The entropy of a system can decrease.
2. The entropy of an isolated system cannot decrease.
3. Entropy generation can be negative in a refrigeration cycle.
Answer: B
The first two are correct and the distinction between them matters greatly. The third is false, since a refrigerator moves entropy about by paying work but generates none that is negative. The surroundings gain more entropy than the cold space loses.
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