Abstract
CWILONG1 has determined the highest temperatures at which ice forms in the cloud produced by adiabatic expansion in a Wilson cloud chamber. He found a threshold temperature of –41·2 ± 0·2° C. for air which had been cleaned by repeated expansions, and of –32 ± 1·0° C. for outdoor air at Oxford. He has since repeated the experiments with outdoor air on the Jungfraujoch2, and on the Atlantic and Pacific Oceans 3 : he found the clean air threshold on all but one occasion.
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References
Cwilong, B. M., Proc. Roy. Soc., 190, 137 (1947).
Cwilong, B. M., Nature, 160, 198 (1947).
Cwilong, B. M., Nature, 161, 62 (1948).
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PALMER, H. Distribution of Ice-Particle Nuclei in the Free Atmosphere. Nature 162, 568 (1948). https://doi.org/10.1038/162568a0
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DOI: https://doi.org/10.1038/162568a0
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