Physics Assignment Help With Angle of contact

The angle of contact is different for different pairs of solids and liquids. For mercury and glass, the angle of contact is 135°. For ordinary water and glass, the angle of contact is nearly 8°.

9.18 Capillary Effect

The phenomena of rise of liquid, against gravity, in a five tube, called capillary tube, is know as capillary effect. In some case, the liquid also fall below the surface of liquid. If the liquid makes an acute angle with the surface of tube, then liquid rise in the capillary tube and its free surface, called meniscus, is concave in upward direction. On the other hand, of the liquid makes an obtuse angle, then liquid fall and the meniscus is convex upward as shown in figure.

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