The sound velocity has been measured as a function of temperature and hydrostatic pressure for a number of organic liquids and for water-methanol mixtures. These data have been used to compute the ratio B/A of the coefficient B of the quadratic term to that of the linear term A in the adiabatic expansion of pressure changes in terms of density changes. The ratio has also been computed (by use of data from other sources) for sea water and for five alcohols. A discussion is given of various methods of computing B/A.
The ratio of B/A in the adiabatic expansion for pressure p as a function of the density ρ, p=po+A (ρ−ρo)/ρo+B (ρ−ρo)2/2ρo2 is reported for a number of organic liquids. A detailed comparison of these values, obtained from measurement of the sound velocity as a function of the hydrostatic pressure and the temperature, is made with measurements reported by other observers from finite amplitude measurements. Possible reasons are advanced for the rather wide discrepancies. [Work supported in part by the U. S. Office of Naval Research.]
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