Discussion
Supersaturation in a natural cloud typically peaks at about
Answer: D
Correct answer: a few tenths of one per cent
Peak supersaturation in a natural cloud is typically 0.1 to 1 per cent, and it is held there by the feedback described above. The figure matters because it is far below the several hundred per cent homogeneous nucleation would require - which is the whole reason condensation nuclei are indispensable - and because it decides which part of the aerosol population becomes cloud droplets.
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