The sessile drop method is a technique used to measure the contact angle between a liquid droplet and a solid surface, helping to assess the wettability of that surface. This method involves placing a small droplet of liquid on a flat, solid substrate and then measuring the angle formed at the liquid-solid interface. The resulting contact angle provides insight into how well the liquid spreads on or adheres to the surface, which is crucial for understanding various phenomena such as adhesion, coating, and fluid behavior in multiphase systems.
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