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Chapter 9

Experimental Methods of Capillarity

This chapter is devoted to describing various methods to measure surface and interfacial tensions of liquids and measurements of contact angles at the solid/liquid interface, with applications to smooth plane surfaces, powdered solids, and solid fibers. The Washburn equation is derived to describe the rate of penetration of a porous solid by a liquid.

Key Words: capillary height, drop weight, Du Noüy ring, goniometer, immersion, Langmuir balance, pendent drop, sessile drop, spinning drop, vibrating jet, Wilhelmy plate




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