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Explain Why Mercury on a Clean Glass Slide Collects Into Small Spherical Balls

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Explain Why Mercury on a Clean Glass Slide Collects Into Small Spherical Balls

Question

Mercury on a clean glass slide collects into small spherical balls as shown in the figure below.
physics Question
Explain why.

Answer

Cohesive force between mercury molecules is stronger than the adhesive force between mercury molecules and the glass side.