Mercury does not wet glass,wood,or iron becau | vedclass

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Question

(B) The wetting of a surface by a liquid depends on the relative magnitudes of the cohesive force (force between liquid molecules) and the adhesive fo

Vedclass · Accepted Answer

Cohesive force is greater than adhesive force

Vedclass · Answer

(B) The wetting of a surface by a liquid depends on the relative magnitudes of the cohesive force (force between liquid molecules) and the adhesive force (force between liquid molecules and the solid surface molecules).If the cohesive force is greater than the adhesive force,the liquid molecules prefer to stay together rather than stick to the solid surface.In the case of mercury,the cohesive force between mercury atoms is significantly stronger than the adhesive force between mercury atoms and the molecules of glass,wood,or iron.Consequently,mercury does not wet these surfaces and forms a convex meniscus,resulting in an obtuse angle of contact $(> 90^o)$.

Mercury does not wet glass,wood,or iron because

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