The contact angle, θ, is the angle that a droplet of liquid makes at the point which it makes contact with the surface upon which it is resting. The size of the angle provides information relating to the surface energy and therefore the wetting capacity of the surface. This is especially relevant to adhesive bonding and coating processes. The smaller the angle, the higher the surface energy and the easier it will be to wet the surface. For more information, please see FAQs relating to surface energy and wetting.
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