The Interfacial Tension between the Liquid and Solid Phases of 3He and of 4He

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Abstract
When helium is confined in small pores the solidification process is shifted well away from the normal melting curve. The amount of this shift in terms of pressure can be written approximately as ΔP=-\frac{2\text{V}_{\text{L}}}{\text{V}_{\text{L}}-\text{V}_{\text{S}}}·\frac{\gamma\cos\Theta}{\text{r}} where VL and VS are the molar volumes of the liquid and solid phases, γ is the inter facial tension and Θ is the angle made by the liquid-solid meniscus at the containing wall. The radius of the containing pores is given by r. By carrying out isopycnal measurements successively on 3He and 4He in the same sample of porous glass we have determined their relative interfacial tensions.

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