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Force of a capillary bridge as a function of volume of water inside the bridge. (a) On a different substrate (blue: PVC, z1 = 1.50 mm; grey: aluminium, z1 = 1.63 mm; green: glass, z1 = 1.14 mm). Dashed lines correspond to fits using equation (4.8) and θPVC = 80°, θglass = 55° and θaluminium = 75°. (b) Comparison of the force direct measurement (filled circle) and by optical measurement (star) and equation (4.7) (aluminium, z1 = 1.63 mm).
