Surface tension is a force that acts on particles at a liquid's surface. It is caused by the cohesive forces between the liquid molecules, which tend to pull them together. This force is responsible for the formation of droplets, bubbles, and other curved surfaces in liquids.

The surface tension of a liquid is measured in newtons per meter (N/m). The higher the surface tension, the stronger the cohesive forces between the liquid molecules and the more difficult it is to break the surface of the liquid.

Some common examples of surface tension include:

* The formation of water droplets on a faucet

* The ability of insects to walk on water

* The formation of bubbles in a glass of soda

* The ability of oil to spread out on water

Surface tension is an important property of liquids that has a wide range of applications in everyday life and in industry.