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Densities, ρ, and dynamic viscosities, η, of triethylamine + water (TEA−W) binary mixtures have been determined experimentally in the single phase region and over the whole composition range at T = (283.15 to 291.35) K. The experimental measurements of these properties were carried out at atmospheric pressure. Results have been fitted to obtain the adjustable parameters and standard deviations between the measured and fitted values, respectively. The viscosity data have been also correlated with the equations of Grunberg−Nissan, Hind et al., Katti−Chaudhri, Heric−Brewer, McAllister, and Auslander.

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Measurements of the coexistence curve of the binary-fluid mixture isobutyric acid + water with added KCl salt at various concentrations show an important dependence on the critical temperature and the critical exponent β. The phase-transition region shifts as a function of the salt concentration. The effective -critical exponent β * = (0.266-0.293) is neither compatible with the Ising value β = 0.325 nor with the Fisher renormalized value ∼ 0.365.

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The tracer diffusion coefficient D3+ of the trivalent lanthanide cation 153Gd3+ is studied in mixtures of isobutyric acid, water and 5*10-4 M Gd(NO3)3 using an open-ended capillary tube. These data are given over the complete composition range at T-Tc=0.171 K. The coefficients D3+ are combined with the shear viscosity eta of the electrolyte. The results are discussed in terms of the Einstein-Stokes law; our analysis suggests three different behaviours of the diffusing entity in the mixtures and it is based on the preferential solvation phenomenon.