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PLEASE HELP!
If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be

A. higher than the mercury in the vessel, and shaped like the outside of an umbrella.
B. higher than the mercury in the vessel, and shaped like the inside of a bowl.
C. lower than the mercury in the vessel, and shaped like the outside of an umbrella.
D. lower than the mercury in the vessel, and shaped like the inside of a bowl.

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The answer is A .
Due to air pressure, the mercury in the tube will be higher than that in the vessel.
Mercury in a container, the center of the liquid is always higher, so it is shaped like the outside of an umbrella.

Answer:

option (c)

Explanation:

A small diameter open tube is called capillary tube.

When a capillary tube is immersed in a vessel containing mercury, then the mercury falls in the capillary tube and the shape is like outside of an umbrella.  

As the angle of contact for mercury and glass is obtuse, so it falls in the tube and the meniscus is convex.

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