Abstract
AbstractDroplets of radius exceeding 30 μ are sometimes found in concentrations of order 100/l in non‐precipitating cumulus less than 5,000 ft in depth and having, on average, liquid‐water contents of only a few tenths of a gramme per m3. It is shown that droplets of this size may be produced by condensation and coalescence on hygroscopic nuclei of mass greater than 10−11 g entering the bases of such shallow clouds, provided that these last for at least one hour. The published concentrations of giant salt nuclei seem only just sufficient to account for the observed numbers of large droplets, but simultaneous measurements of both are urgently required.
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