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Capillary bridge between two parallel surfaces. When the top and bottom contact angles (θ and Φ) are greater than 90°, the pressure force (Fp) pushes the top plate upwards and the surface tension force (FT) acts downwards to pull the plates together. The two principle radii of curvature (R1 and R2) can be are used to calculate the pressure difference across the interface and RTop is the contact radius of the droplet to the top plate.
