High Quality Content by WIKIPEDIA articles! A Wilhelmy plate is a thin plate that is used to measure equilibrium surface or interfacial tension at an air-liquid or liquid-liquid interface. In this method, the plate is oriented perpendicular to the interface, and the force exerted on it is measured. Based on the work of Ludwig Wilhelmy, this method finds wide use in the preparation and monitoring of Langmuir-Blodgett films.The Wilhelmy plate consists of a thin plate usually on the order of a few centimeters square. The plate is often made from glass or platinum which may be roughened to ensure complete wetting. The plate is cleaned thoroughly and attached to a scale or balance via a thin metal wire.

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