Definition, Meaning & Synonyms

capillary action

Noun

/ˈkæpɪlɛri ˈækʃən/

Definition

The process by which liquid rises or falls in a narrow space without the assistance of external forces, due to the intermolecular forces between the liquid and surrounding solid or liquid surfaces.

Examples

The capillary action of water allows it to travel through the tiny tubes of plants, helping them absorb nutrients.
In a sponge, capillary action pulls water into its porous structure.
Capillary action is essential in processes such as ink moving through a fountain pen.

Meaning

Capillary action is a phenomenon that occurs when the adhesive forces between the liquid molecules and the molecules of a solid are greater than the cohesive forces among the liquid molecules themselves.