Question

The surface tension of a liquid at its boiling point is:

• A. maximum
• B. zero
• C. same as at room temperature
• D. minimum but more than zero

Answer 1

Answer: (B)

zero

As the temperature increases, surface tension decreases. At the boiling point, every molecule of a liquid are in motion from bottom to surface, and due to rise in temperature, molecules lose the adhesion and hence, surface tension becomes zero.