Question

What is the shape assumed by the surface when a non-wetting liquid is placed in a capillary tube? 

Options

• Concave upward

• Convex upward

• Plane

• Some other shapes mentioned above

Answer 1

Convex upward

Explanation:

The meniscus of a liquid that does not soak the container walls, such as mercury and glass, is convex upwards and the angle of contact is obtuse (i.e., θ > 90°).