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What does convection mean?

Looking for the meaning or definition of the word convection? Here's what it means.

Noun
  1. The process of conveying something.
  2. (physics) The transmission of heat in a fluid or gas by the circulation of currents.
  3. (meteorology) The vertical movement of heat and moisture, especially by updrafts and downdrafts in an unstable air mass. The terms convection and thunderstorm are often used interchangeably, although thunderstorms are only one form of convection. Towering cumulus clouds are visible forms of convection.
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Examples
Although its name would imply that it radiates heat, the radiator actually dissipates the coolant's heat not by radiation but by convection.
The moist yet cool south-west airstreams undercut the dry and hot continental air, leading to vigorous and deep convection.
In the tandoor, the breads are slapped onto the vertical wall, where they bake quite quickly by a combination of radiant heat and convection.
Surface warming leads to cumulus convection and release of latent heat, producing warm temperatures throughout the troposphere.
When dissolved solids are carried along with the flowing groundwater, the process is called advective transport or convection.
This convection results in the Sun's surface not being smooth, but covered with thousands of these globules, which are called granules.

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