Question

The wettability of a surface by a liquid depends primarily on:

• A. Viscosity
• B. Surface tension
• C. Density
• D. Angle of contact between the surface and the liquid

Answer 1

The correct option is D Angle of contact between the surface and the liquid

If the angle of contact $\left(\theta \right)$ formed by the liquid at a solid surface decreases, then wettability of the surface by the liquid will increase, because liquid will tend to spread more at the solid surface.

Hence, wettability of a surface by a liquid depends primarily on the angle of contact between the surface and the liquid.