The Velocity of First Sound in Liquid Helium

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, , Citation K R Atkins and C E Chase 1951 Proc. Phys. Soc. A 64 826 DOI 10.1088/0370-1298/64/9/309

0370-1298/64/9/826

Abstract

The velocity u1 of ordinary sound in liquid helium has been measured in the temperature range from 1.2° K. to 4.2° K Its value extrapolated to 0° K. is compared with the velocity u2 of second sound at 0.1° K. and a slight departure from the Landau relation u2 = u1/√3 is indicated. The behaviour of u1 in the neighbourhood of the λ-point has been studied in detail

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10.1088/0370-1298/64/9/309