Surface Tension - Defintion, Experiment, Observation, Example

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What is Surface Tension

Surface tension is the property of the free surface of a liquid at rest behave like a stretched membrane in order to acquire minimum surface area. Surface tension can be defined as the force acting per unit length perpendicular on an imaginary line drawn on the liquid surface, tending to pull the surface apart along the line. Its unit is N m^-1 and dimensional formula is MT^-2.

The property of Surface Tension gives rise to an interesting phenomenon known as capillarity. Capillarity is nothing but the rise of a liquid in a capillary tube. Examples of Capillarity are blotting paper absorbs ink, the oil in the lamp rises up the wick and the sponge retains water.

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