Discussion
Consider the following statements about atmospheric supersaturation.
1. Supersaturation in natural clouds rarely exceeds about one per cent.
2. Condensation nuclei allow droplets to form at such low supersaturations.
3. Supersaturations of several hundred per cent are common in clouds.
Answer: B
The first two are correct and follow from the abundance of nuclei. The third describes the requirement for droplet formation in perfectly clean air, a condition the real atmosphere never approaches. Nuclei are abundant enough that saturation is exceeded only very slightly.
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