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Adhesion is the force of attraction between contacting surfaces of unlike substances, such as wood and glue or water and glass. Adhesion is due to intermolecular forces of the same kind as those causing cohesion. Thus the force depends on the nature of the materials, temperature, and the pressure between the surfaces. A liquid in contact with a solid surface will "wet" it if the adhesive force is greater than the cohesive force within the liquid.

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