Angle of Contact
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Definition:
Associated with the phenomenon of wetting. A drop of liquid contacting a solid surface can remain exactly spherical, in which case no wetting occurs; or it can spread out to a perfectly flat film indicating complete wetting. The angle of contact is the angle between the tangent to the periphery of the point of contact with the solid, and the surface of the solid. When the drop spreads to a perfectly flat film, the angle of contact is zero. If it remains exactly spherical, the area of contact is a point only, and the angle of contact is 180 degrees.
Definition Copyright ©1989 CRC Press LLC. All rights
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