Discussion
Assertion (A): Rising air cools even though no heat is removed from it.
Reason (R): It expands against the lower pressure aloft and does work at the expense of its own internal energy.
Answer: B
Both are true and the reason gives the mechanism, and this adiabatic cooling is what makes ascent the dominant route to cloud formation in the atmosphere. No external refrigeration is involved at any point in the process.
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