Definition

Noun: A small, spherical pocket of air, typically trapped within a liquid or a solid substance. It is a cavity filled with air or gas, often visible as a round, glistening sphere.

Usage

An "air bubble" refers to a discrete volume of air enclosed by another material. It is commonly observed in liquids (like water or molten glass) and within soft or viscous solids (like soap, rubber, or dough).

Examples

• The diver watched the air bubbles rise to the surface from his oxygen tank.
• To ensure a smooth finish, the painter popped the air bubbles in the wet varnish with a brush.
• The child was fascinated by the air bubbles trapped inside the ice cube.

Advanced Usage

• In Finance/Economics: The term "bubble" (not "air bubble") is used metaphorically to describe a rapid increase in asset prices followed by a sharp contraction, e.g., . The core word "air bubble" itself is not used in this financial idiom.
• In Medical Contexts: An "air bubble" in an intravenous (IV) line can be dangerous and must be removed before injection.

Variants and Related Words

• Bubble (n): A more general term for a thin sphere of liquid enclosing air or gas. An "air bubble" is a specific type of bubble where the interior is air.
• Air Pocket (n): A localized region of low air density that can cause an aircraft to drop suddenly; conceptually similar to a bubble of different air.

Synonyms

• Gas pocket
• Blister (when in a solid surface layer, like paint)

Antonyms

• Vacuum cavity (a void containing no air/matter)
• Solid inclusion

Related Phrases

• To form bubbles: To create air bubbles.
  • The boiling water began to form bubbles.
• To trap an air bubble: For an air bubble to become enclosed.
  • Be careful not to trap an air bubble under the screen protector.
• Air bubble level (or spirit level): A tool using a bubble in liquid to check if a surface is level.

Noun

1. a bubble of air