New technique applied to the ring method for determining surface tension of molten salts

A new simple technique applied to the ring method for determining surface tension of molten salts is described. A small-sized motor which is operated by a light-sensitive phototransistor and is suspended from a balance pan is used for lowering and rising the ring. The present method was tested by determinating the surface tension of molten NaNO(3), KNO(3), and HTS (molten NaNO(3)-KNO(3)-NaNO(2); 7-44-49 mol%). Published values for molten NaNO(3) and KNO(3) are convenient for checking whether our obtained data are adequate or not. No data, to our knowledge, are available for the surface tension of HTS. In these experiments, it was shown that the new method performed well.