WITHIN the last twenty odd years there have been produced a number of synthetic chemicals analogous to soaps. These agents, like soaps, penetrate the "supposed tension of the surface" of any liquid but, unlike soaps, are not affected by hard water. The name ``surfaceactive agents" has been given to these synthetic preparations.The "Glossary of Physics"1 gives this definition of surface tension:... the peculiar effect of cohesion manifested at the free surface of a liquid or at the interface of two immiscible liquids, and giving the impression of a tense. elastic skin membrane. It is measured in units of force per unit length, e. g., dynes per centimeter along the line on the surface.A number of these surface-active agents have been prepared2 to be used in such diverse industries as the manufacture of shampoos, dentifrices, inks, dyeing products, cosmetics, lubricating materials, the processing of leather,
FELDMAN JB, DeLONG P, BROWN CP. PRACTICAL APPLICATION OF SURFACE-ACTIVE DRUGS IN OPHTHALMOLOGY. Arch Ophthalmol. 1948;40(6):668–679. doi:10.1001/archopht.1948.00900030683007
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