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THEsurface tension of the liquid in a fractionating column is thought to be one of the important factors which control the plate efficiency (6). In order to evaluate this factor practically, the surface tensions of ethyl alcohol-water mixtures have been determined at temperatures below and at their atmospheric boiling points.

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The density of pure anhydrous isopropyl alcohol, prepared by treatment with calcium oxide and subsequent fractionation until the still liquid and distillate were identical, was found to be 0.77223 ± 0.00002 gram per ml. at 35°G. Density-composition data were obtained for the system isopropyl alcohol-water at FOR determining accurately and rapidly the composition of small alcohol-water samples, an improved pycnometric technique has been developed using 6-8 ml.pycnometer bulbs of the Ostwald type, fitted with groundglass caps (Figure 1). The density-composition data of Lebo (6) for isopropyl alcohol-water mixtures, determined within