Abstract
THE main properties of liquid helium have been familiar to men of science for a great many years. The only object therefore in liquefying it is in order to cool other substances the characteristics of which it is desired to study in the neighbourhood of the absolute zero. It has long been known that the heat capacity of solids becomes extremely small at low temperatures. Thus the latent heat of evaporation of 20 mgm. of liquid helium is sufficient to cool 60 gm. of copper from the temperature to be attained with liquid hydrogen boiling under a reduced pressure to the boiling point of helium.
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LINDEMANN, F., KEELEY, T. Helium Liquefaction Plant at the Clarendon Laboratory, Oxford. Nature 131, 191–192 (1933). https://doi.org/10.1038/131191a0
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DOI: https://doi.org/10.1038/131191a0
