The wetting model is a classical problem in surface and biomimetic science.  Wettability is determined by the balance between adhesive and cohesive forces, adhesive which is when a liquid tries to spread on a surface and cohesive when it forms into a ball.

The resultant between adhesive and cohesive forces is called the contact angle. As the tendency of a drop to spread out over a surface increases, the contact angle decreases, making the contact angle an inverse measure of wettability.

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