Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 133
ameter is u. 97. The Normal Pressure on a Curved Film. — Astretched film with a curvature must always exhibit a normal pressure directedtoward^he concave side. Let ab (Fig. 59) be asmall portion of the sectionof a cylindrical film. T and^represent the surface tension, stretching this film ofunit… … = 2T sin But sin J$ = — , R being the radius of curvature of2iH the film or the radius of the cylinder. Therefore If ab is unity, then the surface of the film considered isone square unit, and the normal pressure per unit surface T is P = — , or T times the curvature.R ME CHAN rCS OF FLUIDS. 128…
Physics
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