Engineering Board Exam Reviewer · Fluid Mechanics · easy

Surface tension is caused by:

1. Adhesion between liquid and container
2. Viscosity of the liquid
3. Gravity acting on the liquid
4. Cohesion between liquid molecules at the surface

Answer

D. Cohesion between liquid molecules at the surface

Solution

Unbalanced cohesive forces at a free surface produce a 'membrane' tension (N/m).

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