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surface tension
This soap bubble exists because of the surface tension of this liquid.Credit: Wikimedian Mila Zinkova, Edited by Alvesgaspar.

surface tension:

A property of the surface of a liquid that makes the surface pull together to take up the smallest possible area. It is caused by the attraction of molecules in a liquid. It makes a liquid surface behave as if it has an elastic film stretched over it.