Abstract
BURTON and others1 have measured the velocity of ultra-sonic waves in liquid helium under its own vapour pressure, and compared the results with the thermo-dynamic properties of the substance. In the helium I range they derive an adiabatic compressibility, which shows a minimum at 2.5° K. In order to find the isothermal values, we have to multiply by = cp/cv. can be calculated from the specific heat2 at vapour pressure cs with the help of the thermodynamic diagrams3. It is interesting that in the isothermal curve the minimum has disappeared. The minimum in the adiabatic compressibility is connected with the rapid rise of cp/cv above the λ-point.
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References
Burton, E. F., NATURE, 141, 970 (1938); Findlay, J. C., Pitt, A., Smith, H. Grayson, and Wilhelm, J. O., Phys. Rev., 54, 506 (1938).
Keesom, W. H., and Keesom, Miss A. P., Commun. Kamerlingh Onnes Lab., Leiden, No. 235d; Physica, 2, 557 (1935).
Keesom, W. H., and Keesom, Miss A. P., Commun. Kamerlingh Onnes Lab., Leiden, Suppl. No. 76b; Physica, 1, 128 (1933–34).
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GROENEWOLD, H. Velocity of Sound in Liquid Helium. Nature 142, 956–957 (1938). https://doi.org/10.1038/142956b0
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DOI: https://doi.org/10.1038/142956b0
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