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and is primarily a physical property related to interfacial tension, rather than a chemical property.

Theory

In 1805, Thomas Young defined the contact angle ? by analyzing the forces acting on a fluid droplet resting on a solid surface surrounded by a gas.

:where
: = Interfacial tension between the solid and gas
: = Interfacial tension between the solid and liquid
: = Interfacial tension between the liquid and gas

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