What is surface tension ?

What is surface tension ?
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Answer :

Surface tension is a property of liquids. If a line is imagined on the surface of a liquid, then the force acting on either side of the line perpendicular to the line per unit length and tangent to the surface is called the surface tension of that liquid.
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A needle or a pin floats on the surface of water because of – (1) Surface tension (2) Surface energy (3) Viscosity (4) Adhesive force

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