The contact angle is a measure of the wettability of a solid surface by a liquid. It is defined as the angle formed between the tangent to the liquid interface and the solid surface at the three-phase contact line, where the solid, liquid, and gaseous phases meet. In practical terms, the contact angle can provide insights into how a liquid will interact with a solid surface: - **Low Contact Angle (0° to 90°)**: Indicates that the liquid wets the surface well.

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