Young–Dupré_equation | TriviaQuestions.online

⭐ In the context of contact angle, the Young–Dupré equation is primarily used to determine…

The Young–Dupré equation quantifies wettability by relating the contact angle to the surface tensions of the solid, liquid, and vapor phases, thus predicting the equilibrium state of the liquid on the solid surface.

⭐ Core Definition: Young–Dupré equation

Wetting is the ability of a liquid to maintain contact with a solid surface by displacing another substance or material - either a gas, or other liquid not miscible with the wetting liquid - due to the differential strength of intermolecular interactions with the surface.

The degree of wetting, or wettability, is dependent on the force balance between adhesive and cohesive forces, occurring when liquid and solid make contact in the presence of another physical phase. As such, wetting is of importance to bonding and adherence of substances in different phases.

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👉 Young–Dupré equation in the context of Contact angle

The contact angle (symbol $θ C$ ) is the angle between a liquid surface and a solid surface where they meet. More specifically, it is the angle between the surface tangent on the liquid–vapor interface and the tangent on the solid–liquid interface at their intersection.It quantifies the wettability of a solid surface by a liquid via the Young equation.

A given system of solid, liquid, and vapor at a given temperature and pressure has a unique equilibrium contact angle. However, in practice a dynamic phenomenon of contact angle hysteresis is often observed, ranging from the advancing (maximal) contact angle to the receding (minimal) contact angle. The equilibrium contact is within those values, and can be calculated from them. The equilibrium contact angle reflects the relative strength of the liquid, solid, and vapour molecular interaction.

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