Osmotic Pressure of Degenerate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Mixtures

The osmotic pressure of ${\mathrm{He}}^{3}$-${\mathrm{He}}^{4}$ mixtures has been measured down to 0.027\ifmmode^\circ\else\textdegree\fi{}K. The results are used (a) to check the validity of the ${\mathrm{He}}^{3}$-${\mathrm{He}}^{3}$ effective interaction deduced from transport data using recent exact solutions of the Boltzmann transport equation, (b) to obtain the limiting solubility of ${\mathrm{He}}^{3}$ in ${\mathrm{He}}^{4}$ as a function of pressure, and (c) to demonstrate the metastability of supersaturated mixtures of ${\mathrm{He}}^{3}$ in ${\mathrm{He}}^{4}$ in the absence of a free surface.

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