PPT Slide

34

• Mercury has a  higher surface  tension than water

• The cohesive forces  among mercury atoms  are stronger than the  adhesive forces  between mercury and  glass giving a convex  meniscus in glass  tubes.

• Water has a concave meniscus in glass tubes because the adhesive  (H bond) forces with the OñSiñO groups of glass are stronger than  the cohesive (H bond) forces within the water.

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