What is the shape of meniscus of pure water in clean glass capillary tube?

The shape of meniscus of pure water in clean glass capillary tube is concave. 
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Can the shape of meniscus of water in capillary tube be convex?


Yes. The meniscus of water in capillary tube can be convex. 
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What is the thickness of surface film?

The thickness of surface film is equal to range of intermolecular forces of that liquid.
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What is meniscus?

Meniscus is the curved upper surface area of the liquid near the walls of the container.
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Why do the two mercury drops coalesce when brought together?

Molecules of mercury coalesce due to strong cohesive force between the mercury molecules. 

Cohesive force is the force of attraction between like molecules. 
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