The Heat of Mixing ofHe3andHe4Solutions

Abstract

None of the current theories of ${\mathrm{He}}^3$ and ${\mathrm{He}}^4$ solutions is really satisfactory. In order to decide which of these makes the correct approach to the problem, experiments on the heat of mixing can be very useful. It is shown here that various theories predict remarkably different behavior for this quantity. In particular de Boer and Gorter theory gives rather high values for heat of mixing per mole of ${\mathrm{He}}^3$ A comparison of the theoretical and experimental results should thus show clearly the need of Taconis hypothesis in explaining the various properties of ${\mathrm{He}}^3$ and ${\mathrm{He}}^4$ solutions.