Some 200 surface tension determinations were made on 107 single-salt melts using eight experimental techniques. From a consideration of the experimental difficulties, such as the inconvenience of visual observation on the melt, the corrosive nature of the melt, volatilization and condensation of salt vapors on apparatus, the most versatile method recognized to be applicable to these molten systems at elevated temperatures is the method of Maximum Bubble Pressure, by which 75 per cent of the total determinations on the 107 salts were made. Other methods in descending percentages of application are: Wilhelmy Slide Plate, Capillary Rise, Maximum Pull on Cylinder, Pin Method, Pendant Drop, Ring Method and Sessile Bubble. The basic principles, surface tension range of applicability and temperature limitation for these techniques are briefly considered. (Author)
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