Abstract
The velocity of sound in ethyl alcohol was measured in the temperature range 0.3⩽T⩽58.0°C for pressures between 1.03 kg/cm2 and 1000 kg/cm2. An empirical equation was fitted to the velocity data in these ranges and differentiated to give tables for (∂C/∂p)T/C and (∂C/∂T)p/C. The ratio of the temperature coefficient of density to the temperature coefficient of sound velocity was computed to show that Rao's constant is a function of temperature and pressure. The ratio 1ρ(∂ρ∂P)T⧸1C(∂C∂P)T = −21 − (∂B/∂P)T, (1) where B is the isothermal bulk modulus, is independent of temperature and varies nearly linearly with pressure. Kittel's equation for the available volume model of liquids and the equation for the free volume model (Eyring and Hirschfelder) were differentiated and substituted in Eq. (1). The results will be compared with the information obtained from the present work.
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