Q. A liquid does not wet the solid surface if the angle of contact is
A) Zero
B) equal to 45${^\circ}$
C) equal to 90${^\circ}$
D) greater than 90${^\circ}$
Explanation
(d) A liquid does not wet the solid surface if the angle of contact is obtuse ie, greater than $90{^\circ}$. In this case cohesive forces will be greater than adhesive forces and so, the liquid does not wet the surface of solid.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.