Question

write about the Surface Tension:​

Answer 1

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As seen previously, the free surface of a liquid in a container acts as a stretched membrane and all molecules on the surface film experience a stretching force. Imagine a line PQ of length L drawn tangential to the free surface of the liquid,

All the molecules on this line experience equal and opposite forces tangential to surface as if they are tearing the surface apart due to the cohesive forces of molecules lying on either side.