Abstract
IN 1933 Bergeron1 postulated that rain falls only from clouds which contain both water drops and ice crystals. Natural cumulus clouds at temperatures above -13° C. often contain only supercooled water drops and no icecrystals. If a method existed of planting crystal 'germs' in these clouds, the crystals would grow into large snowflakes at the expense of the water drops and eventually fall as rain or snow.
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References
Union Géodesique et Géophysique International (Lisbon, 1933).
Science Newsletter, Washington (November 23, 1946).
Volmer, "Kinetik der Phasenbildung", reprinted by Brothers Edwards, Arbor Ann, Michigan .
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KRAUS, E., SQUIRES, P. EXPERIMENTS ON THE STIMULATION OF CLOUDS TO PRODUCE RAIN. Nature 159, 489–491 (1947). https://doi.org/10.1038/159489a0
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DOI: https://doi.org/10.1038/159489a0
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