Abstract
DB. P. KAPITZA describes new experiments from which he deduces that the viscosity of helium II (below the λ-point) is at least 1,500 times more than that of helium I at normal pressure, which may account for the abnormally high heat conductivity of helium II. He suggests that helium, below the λ-point, enters a special state that may be called super fluid. Further experiments are reported by J. F. Allen and A. D. Misener indicating that the flow of helium II at 1° K. does not follow the ordinary equation for laminar or turbulent motion. The authors consider that the type of motion observed might arise from slipping of helium II over the surface of the tube, in which case the flow method would not be likely to give a value of the viscosity which had much meaning, and that undamped turbulent motion cannot account for an appreciable part of the high thermal conductivity observed.
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Points from Foregoing Letters. Nature 141, 83 (1938). https://doi.org/10.1038/141083a0
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DOI: https://doi.org/10.1038/141083a0