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2020 Phase-2 Mechanical Properties of Fluids Surface tension - angle of contact and wetting Medium Question 19 of 34 in Mechanical Properties of Fluids

A liquid does not wet the solid surface if angle of contact is

A zero

B equal to $45^\circ$

C equal to $60^\circ$

D greater than $90^\circ$

The answer is D.

Solution

A liquid does not wet a solid surface (non-wetting) when the angle of contact is obtuse, i.e. greater than $90^\circ$ (e.g. mercury on glass).

Concept Surface tension - angle of contact and wetting

Mechanical Properties of Fluids in past papers

34 questions from this chapter have appeared across 14 exam years.