Surface tension

Definition

Surface tension is the property of a liquid that causes its surface to behave like a stretched elastic sheet, allowing it to resist external forces and minimize its surface area.

Analogy

Imagine a group of friends holding hands in a circle. The tighter they hold hands, the harder it is for someone from outside the circle to break through. Similarly, surface tension is like the tight bond between liquid molecules that makes it difficult for objects to penetrate or break through the liquid's surface.

Related terms

Capillary action: Capillary action refers to the ability of a liquid to flow against gravity in narrow spaces or tubes due to adhesive and cohesive forces.

Meniscus: The meniscus is the curved upper surface of a liquid in a container caused by capillary action and adhesive forces between the liquid and container walls.

Cohesion: Cohesion is the attraction between molecules of the same substance, causing them to stick together.