Discussion
Assertion (A): Small droplets evaporate more readily than large ones at the same temperature.
Reason (R): The equilibrium vapour pressure rises as the radius of curvature decreases.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason names the Kelvin effect. A molecule at a strongly curved surface has fewer neighbours holding it, so it escapes more readily and the equilibrium vapour pressure over a small droplet exceeds that over a flat surface. The consequence is that in a population of droplets the large grow at the expense of the small, which is the beginning of the size distribution a cloud develops.
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