Abstract
The dependence of the median freezing temperature of supercooled water drops on rate of cooling is studied over a wide range of cooling rates. A polished metal surface, coated with a water repelling film of liquid paraffin is used to support the water drops being frozen. Deeper supercooling is observed with higher cooling rates in the range 0.3 to 5.0 deg C min−1. However, for cooling rates greater than 5.0 C min−1 a reverse trend is indicated and the drops freeze at warmer temperatures. The importance of tins experimental result is discussed in the case of thunderstorm clouds with strong updrafts. A similar effect for sublimation nuclei tested in cold chambers has been noted by Schulz (1947) and by Smith and Heffernan (1954).
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