Which one of the following statements is correct ? .

The angle of contact is defined as the angle between the tangent to the liquid surface and the solid surface at the point of contact, measured inside the liquid [t2]. For water and glass, the adhesive force between the water molecules and the glass is stronger than the cohesive force between water molecules, causing the water to wet the glass and form a concave meniscus [t2][t5]. This results in an acute angle of contact, typically between 8° and 18° [t2]. Conversely, for mercury and glass, the cohesive forces between mercury atoms are significantly stronger than the adhesive forces with the glass [t4]. Consequently, mercury does not wet the glass, forms a convex meniscus, and exhibits an obtuse angle of contact, measured at approximately 138° [t2][t3]. Therefore, water-glass contact is acute while mercury-glass contact is obtuse.

Sources

1. [1] http://www.tgc.ac.in/pdf/study-material/physics/Fluids-surface_tension_and_viscosity-GET4-AD.pdf