Classically, there are three techniques that have been used most frequently to quantify contact angles: sessile drop (a liquid bubble is placed on a solid surface), captive bubble (a gas bubble is placed on the solid surface while immersed in a liquid), and Wilhelmy plate (a solid is immersed and withdrawn from a liquid).1,5-7 Other techniques, such as the DeNouy Ring method, directly measure surface tension8 but are more often used to measure the impact of lens care solutions on wettability of a lens surface. Probably the most common method is the use of a sessile drop of liquid deposited onto the surface of the material by a syringe.
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