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MEASUREMENT OF SURFACE TENSION OF VISCOUS LIQUIDS *
Author(s) -
Bradley C. A.
Publication year - 1938
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1938.tb15730.x
Subject(s) - surface tension , maximum bubble pressure method , bubble , capillary action , viscosity , chemistry , thermodynamics , viscous liquid , mineralogy , materials science , mechanics , composite material , physics
A bstract The surface tensions of liquids of widely differing viscosities have been measured by the maximum bubble‐pressure method. With liquids whose viscosities are greater than about five poises, a modification of the customary technique is employed, which consists in observing the maximum pressure at which a bubble is stable. This is the same procedure which Parmelee used. The applicability of this method for viscous liquids has been tested by measuring the surface tensions at 25° C of a series of solutions of rosin in benzyl‐benzoate whose viscosities varied from about 100 to 2500 poises. The values obtained are within 1 % of those observed by the method of capillary rise. The method has been applied to the measurement of the surface tensions of molten glasses whose viscosities varied from 50 to 2500 poises. The precision obtained is about 1%. A technique for the approximate measurement of surface tension of glasses by means of sessile drops is described.