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Precision density measurements on "gas-free" and "gas-saturated" water (at a total pressure of about 100 kPa and at 208,15 K) yield partial molar volumes at essentially Infinite dilution (Y2") of 20 fluids (about half of them supercritical) In liquid water. The experimental technique Is based on vlbratlng-tube densknetry under flow conditions, the precision of which Is In the range of a few parts per million. The results for the supercritical solutes can be correlated well with a corresponding states relation due to Brelvl and O'Connell, whereas a strictly empirical linear relation between Y2" and Ve2 (critical volume of solute) Is valid for all solutes Investigated.

The Lennard-Jones (6,12) pair potential parameters for solvents can be calculated from gas solubility data by using the scaled particle theory to calculate the work of cavity formation. Values of the hard sphere diameter σ1 and the energy parameter ε1/k at 298.15°K and 1 atm pressure are reported for 39 liquids, polar as well as nonpolar. These parameters are discussed in relation to values determined by other methods.