Thermodynamic interpretation of the Eötvös constant

Palit, Santi R. (1956) Thermodynamic interpretation of the Eötvös constant Nature, 177 (4521). p. 1180. ISSN 0028-0836

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Eötvös in 1886, proposed the following equation for liquids γ(Mνsp.)2/3=KE (Tc-T) where γ is surface tension, M is molecular weight, νsp is specific volume and Tc is critical temperature, which is found to be strikingly valid over a wide range of temperature for most non-polar compounds. Even for polar compounds the equation is valid though to a more limited extent; but the value of the constant, KE, is often very different from the usual value, 2.12. This empirical equation has been given some theoretical support (cf. Partington). The purpose of the present communication is to point out a simple thermodynamic interpretation of the above equation.

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