Abstract
IN discussing the precautions required when liquefying propane for use as a refrigerant for biological specimens, J. L. Stevenson1 points out, and correctly, the necessity for preventing the simultaneous liquefaction of air. However, this liquefaction does not occur at the boiling point of oxygen, 90° K., as would be inferred from his communication, but only at temperatures below the dew point of air, which is about 82° K.
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References
Stevenson, J. L., Nature, 174, 235 (1954).
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COCKETT, A. Use of Liquid Propane as Refrigerant. Nature 175, 780 (1955). https://doi.org/10.1038/175780a0
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DOI: https://doi.org/10.1038/175780a0
