A mercury drop does not spread on a glass pla | vedclass

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(B) The angle of contact is the angle between the tangent to the liquid surface at the point of contact and the solid surface inside the liquid. For a

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Obtuse

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(B) The angle of contact is the angle between the tangent to the liquid surface at the point of contact and the solid surface inside the liquid. For a liquid that does not wet the solid surface,the cohesive forces between liquid molecules are stronger than the adhesive forces between the liquid and solid molecules. In the case of mercury and glass,the angle of contact is approximately $135^\circ$ to $140^\circ$,which is an obtuse angle. Because the angle of contact is obtuse,the mercury drop tends to minimize its contact area with the glass,causing it to remain as a drop rather than spreading.

$A$ mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

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