Abstract
The osmotic pressure of dilute solutions of ${\mathrm{He}}^{3}$ in liquid ${\mathrm{He}}^{4}$ has been measured at 0.32, 0.65, and 1.16\ifmmode^\circ\else\textdegree\fi{}K for concentrations up to 2%. The technique does not require values of the ${\mathrm{He}}^{4}$ fountain pressure and is substantially more precise than previous methods. The results are analyzed in terms of the effective-interaction model of Bardeen, Baym, and Pines as extended to nonzero temperatures by Ebner. The results do not agree well with the theory.
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