Surface tension is the property of a liquid surface in which the surface behaves like a thin elastic film which is attempting to minimize the area and is made by the cohesiveness of the like molecules at the surface.

1. Every framework in the universe tends to limit its potential energy. In like manner, a liquid additionally tends to minimize its surface area accordingly reduce the number of molecules residing on the free surface of the liquid.
2. A strong electrostatic force considered the ‘Vander Waals forces’ acting between neighboring water molecules making them to stick to one another.
3. A molecule in touch with a neighbor is in a lower state of energy than if it were separated from everyone else.
4. The molecules present on the outer layer of the liquid have strong surface tension since they are sharing the charge among fewer molecules (boundary molecules are absent). Accordingly, they have higher energy.
5. The limited number of boundary molecules brings about a minimal surface area that leads to the surface tension.
6. The cohesive force inside molecule (inside) is zero since inside molecules have many neighbours and comparable cohesive force acting everywhere, which is in the lower state of energy. (See the picture).