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Points from Foregoing Letters

Nature volume 135, page 271 (16 February 1935) | Download Citation



THE behaviour of liquid helium indicates that it exists in two forms, helium I and helium II. Their viscosities have been determined in Prof. E. F. Burton's laboratory at Toronto. It appears that when helium I, which is formed at 4.2° K, is further cooled, it becomes more viscous down to 2.3°K; at 2.2° K the liquid suddenly becomes more fluid as it changes into helium II.

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