Plain English Meaning

Heat moves because the air (or liquid) physically moves. Warm air goes up, cool air comes down, and that motion carries the heat with it.

Full Definition

The transfer of heat through a fluid (such as air or water) by the movement of the fluid itself. Warmer, less dense portions rise while cooler, denser portions sink, creating a vertical circulation that carries heat from one place to another.

Context Anchor

Seen in aviation weather discussions, especially when learning about clouds, turbulence, thunderstorms, and rising air over sun-heated ground.

Derivation

From the Latin convehere, meaning 'to carry together.' The word captures the idea that heat is carried along with the moving fluid, rather than passing through a stationary substance.