Surface tension is originated as a result intermolecular forces. Surface tension is concerned with only liquid.
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Does the surface tension of a liquid depend on the area of the free surface of liquid?
Surface tension of the liquid is independent of the area of the free surface of liquid.
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Why ends/edges of glass become round on heating?
Molten gas tries to acquire the minimum surface area and hence heats up due to surface tension. Rounding off the edges makes them acquire the minimum surface area.