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Measurements on the velocity of sound in helium gas at liquid helium temperatures

โœ Scribed by A. Van Itterbeek; G. Forrez

Publisher
Elsevier Science
Year
1954
Weight
204 KB
Volume
20
Category
Article
ISSN
0031-8914

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Apparatus to measure the velocity of sou
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โœ A. Van Itterbeek; G.J. Van Den Berg; W. Limburg ๐Ÿ“‚ Article ๐Ÿ“… 1954 ๐Ÿ› Elsevier Science โš– 179 KB

A description is given of the apparatus used in order to measure the velocity of sound in liquid hydrogen and helium with the optical method, indicated by D e b y e and by B i q u a r d. The light beam enters the cryostat at the top and passes an evacuated glass tube, shut off at the bottom by a pla

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New measurements on the vapour pressure curve of helium were made. They gave temperatures which throughout are slightly higher than those calculated according to the formulae which form the basis of the temperature scale 1932, to a maximum of 0.026 degree for helium II at 1.6 ~ K, and of 0.015 degre