Abstract
FREEZING nuclei in the atmosphere are characterized by a critical threshold temperature below which, and only below which, they initiate the freezing of water droplets with which they may be associated. I have devised a simple method of testing whether or not there is at least one freezing nucleus in a given sample of air (about 200 c.c.) which is active at any given temperature; it is similar to that described by me in 19471, except that expansions are performed more slowly (lasting about 1 sec., and allowing droplet growth to follow the cooling).
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References
Cwilong, B. M., Proc. Roy. Soc., A, 190, 137 (1947); Nature, 160, 198 (1947); 161, 62 (1948); 163, 727 (1949).
Bowen, E. G., Aust. J. Phys., 6, 490 (1953).
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CWILONG, B. Abnormal Freezing Nuclei in the Atmosphere. Nature 176, 129–130 (1955). https://doi.org/10.1038/176129a0
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DOI: https://doi.org/10.1038/176129a0
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