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Which of the following contribute to the reason behind the origin of surface tension?

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+1 vote
in Fluid Mechanics by (118k points)
Which of the following contribute to the reason behind the origin of surface tension?

(a) only cohesive forces

(b) only adhesive forces

(c) neither cohesive forces nor adhesive forces

(d) both cohesive forces and adhesive forces

The question was asked in my homework.

My doubt is from Surface Tension in division Properties of Fluids of Fluid Mechanics

1 Answer

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Best answer
The correct choice is (d) both cohesive forces and adhesive forces

Explanation: The molecules on the surface of a liquid experience cohesive forces due to surrounding liquid molecules acting downward and adhesive forces due to surrounding gaseous molecules acting upwards. Surface tension orginates due to this unbalanced force on the surface molecules.

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