Abstract
THE equation relating density, compressibility and sonic velocity can be expressed as 
where C is the velocity of sonic wave propagation, V is the volume of unit mass, Ks is the isentropic bulk modulus = − V (∂P/∂V)s: and s is entropy.
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References
Richards, W. T., Rev. Mod. Phys., 11, 36 (1939).
Rowlinson, J. S., Liquids and Liquid Mixtures (Butterworths, London, 1959).
Hayward, A. T. J., Acta Imeko, 249 (1964).
Yazgan, E., thesis, Univ. Glasgow (1966).
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HAYWARD, A. Experimental Verification at High Pressure of the Relationship between Compression, Density and Sonic Velocity. Nature 221, 1047 (1969). https://doi.org/10.1038/2211047a0
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DOI: https://doi.org/10.1038/2211047a0
