Answer :
When the angle of contact is obtuse, the free surface of the liquid in a capillary tube forms a convex shape, indicating the liquid is at or below the level in the surrounding container.
In the context of capillary action, when the angle of contact is obtuse, the free surface of the liquid in the capillary tube takes a convex shape. This implies that the liquid doesn't rise above the level in the surrounding container, and might even be depressed, or lower than the level.
The phenomena of capillary action is a result of intermolecular forces, such as adhesion and cohesion, between the liquid and the surface of the capillary tube. For instance, mercury in a glass tube forms an obtuse angle of contact, thus has a convex surface.
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