Surface tension is a type of force that acts to minimize the surface of liquids.
Molecules inside the liquid are pulling together with other molecules around them. At the surface of the liquid also works the 'adhesive force' to attract different substances. Inside the liquid only the 'cohesive force' acts. At this time, when the 'cohesive force' is larger than the 'adhesive force', the surface area is minimized.
Surface tension of water
Water has a higher surface tension than other materials because of the 'hydrogen bonds' between molecules.
Because of the high surface tension of water, the following phenomena occur.
- The water strider can float on water
- Dew drops on the grass have a round shape
- Phenomenon that water does not spill easily even if a clip or coin is put into a glass filled with water