First slide

Surface tension and surface energy

Question

A capillary tube made of glass is dipped into mercury. Then

Moderate

A

Mercury rises in the capillary tube
B

Mercury rises and flows out of the capillary tube
C

Mercury descends in the capillary tube
D

Mercury neither rises nor descends in the capillary tube

Solution

The angle of contact of mercury with glass is obtuse. So it gets depressed below the liquid level outside.

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