Answer:
This is explained in terms of
cohesive and adhesive forces. The attractive forces in the molecules of the
same substance are called cohesive forces while those in the molecules of
different substances are called adhesive forces. In case of mercury, the
cohesive forces are stronger than the adhesive forces. As a result, mercury
gets detached from the glass surface and its level therefore, goes down in the
capillary tube.
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