Surface tension is a type of force that acts to minimize the surface of liquids.
Liquid molecules are pulling together with other molecules around them. This force is called a 'cohesive force.' On the other hand, molecules on the surface have a cohesive force below the surface, but on the surface, they also have an 'adhesion' that pulls them out with different substances. When the coherent force is large and the adhesion is small, it can minimize the interface area to maximize the cohesion force.
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