Definition

Noun: * The elastic tendency of a liquid surface at its interface with air or another gas, caused by the greater attraction of liquid molecules to each other (cohesion) than to the molecules in the air (adhesion). This force acts to minimize the surface area, creating a "skin" or film-like effect.

Usage

• Surface tension is a physical property of liquids.
• It explains phenomena like water beading on a surface, the ability of small insects to walk on water, and the spherical shape of droplets.
• It is typically measured in units of force per unit length (e.g., newtons per meter).

Examples

• The high surface tension of water allows a paperclip to float if placed gently on the surface.
• Soap reduces the surface tension of water, allowing it to spread and wet surfaces more easily.
• Scientists measure the surface tension of a liquid to understand its physical properties.

Advanced Usage

• "To overcome surface tension": Refers to applying enough force or energy to break the cohesive film on a liquid's surface.
  • The detergent helps overcome the water's surface tension for better cleaning.
• "A manifestation of surface tension": Used to describe an observable effect caused by this phenomenon.
  • The formation of droplets is a direct manifestation of surface tension.

Variants and Related Words

• Surfactant (noun): A substance (like soap) that reduces surface tension.
  • Surfactants are key ingredients in detergents and emulsifiers.
• Capillary action (noun): A related phenomenon where liquid flows in narrow spaces without external forces, influenced by surface tension and adhesion.
  • Capillary action allows water to travel up the roots of a plant.

Synonyms

• Interfacial tension (when specifically discussing the boundary between two liquids).

Related Concepts

• Cohesion: The attraction between like molecules (e.g., water to water), which is a primary cause of surface tension.
• Adhesion: The attraction between unlike molecules (e.g., water to glass), which works against cohesion at the edges.
• Meniscus: The curved surface of a liquid in a container, caused by a combination of surface tension and adhesion.

Noun

1. a phenomenon at the surface of a liquid caused by intermolecular forces