Abstract
The thermodynamics of He3 and He4 solutions is considered for temperatures and concentrations for which the solution does not show superfluidity. Calculations of the excess chemical potentials from the experimental vapor pressure data have been carried out between 1°K and 2°K by Roberts and Swartz. It is found that while the behavior of the He3 component can be reasonably explained down to 1°K within the framework of the classical solution theories, no such agreement is obtainable for the He4 component. The discrepancy is explained by extending some general thermodynamical considerations of Gorter regarding pure He4 to the solution. Further it is found that with a suitable choice of the Gibbs free energy expression of pure He4 a satisfactory quantitative agreement is also obtainable along these lines.
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