Question

what do u mean by surface tension?

Answer 1

Surface tension is a phenomenon in which the surface of a liquid acts like a thin elastic sheet.

This term is typically used only when the liquid surface is in contact with gas (such as the air).

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Answer 2

The liquid molecules which are below the surface are in equilibrium.  The liquid molecules which are at the surface are attracted by other molecules in downward direction. So, a force is originated to balance the surface molecules which is equal but opposite in direction to the downward force. This force is called surface tension.