Question

A liquid does not wet the sides of a solid, if the angle of contact is

• A. Zero
• B. Obtuse (more than ${90}^0$)
• C. Acute (less than ${90}^0$)
• D. ${90}^0$(right angle)

Answer 1

Answer: (B)

Obtuse (more than ${90}^0$)

When the contact angle is obtuse (more then ${90}^o$), liquid beads up and does not easily penetrate the solid to wet it. So the correct answer is 'B'.