Discussion
Which second law statement constrains atmospheric processes?
Answer: B
The second law places a direction on natural processes that the first law does not supply, forbidding heat from flowing spontaneously from cold to hot and limiting the efficiency of any engine. The other statements listed are the first law and two properties of ideal gases. Distinguishing what each law forbids is essential when reasoning about atmospheric energy conversions. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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