Letter | Published:

Viscosity of Liquid Helium below the λ-Point

Nature volume 141, page 74 (08 January 1938) | Download Citation



THE abnormally high heat conductivity of helium II below the λ-point, as first observed by Keesom, suggested to me the possibility of an explanation in terms of convection currents. This explanation would require helium II to have an abnormally low viscosity; at present, the only viscosity measurements on liquid helium have been made in Toronto1, and showed that there is a drop in viscosity below the λ-point by a factor of 3 compared with liquid helium at normal pressure, and by a factor of 8 compared with the value just above the λ-point. In these experiments, however, no check was made to ensure that the motion was laminar, and not turbulent.

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  1. 1.

    , NATURE, 135, 265 (1935); , and , Proc. Roy. Soc., A, 151, 342 (1935).

  2. 2.

    NATURE, 140, 62 (1937).

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  1. Institute for Physical Problems, Academy of Sciences, Moscow. Dec. 3.

    • P. KAPITZA


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