Question

Cause of origin of surface tension

Answer 1

Because of this, the surfacemolecules acts as a stretched membrane and is attracted inward finally resulting surface tension. This is how surface tension is originated. In short, surface tension is originated due to unequal existence of cohesive force felt by surface molecules of liquid

Answer 2

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Here is your answer

Surface tension is defined as the force acting per unit length perpendicular to the line drawn on the surface of the liquid

Unit : NM^-1 or KgS-2