The measurement of how strongly particles attract one another at the surface of a liquid is surface tension.
Surface tension of liquids can be stated as the attractive force exerted upon the surface molecules of a liquid by the molecules under it, that tends to draw the surface molecules into the bulk of the liquid and makes the liquid assume the shape having the least surface area possible.
It is caused due to the presence of the cohesive forces, a molecule located in the bulk is pulled equally in every direction by the surrounding liquid molecules, resulting in a net force of zero whereas the molecules at the surface do not have the same molecules on all sides and therefore they are pulled inward. This creates an internal pressure and forces liquid surfaces to contract to the minimum surface area possible.
Hence, surface tension is the measurement of how strongly liquid particles attract one another at the surface of the liquid.
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