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.
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