- Physics. the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
- Meteorology. the vertical transport of atmospheric properties, especially upward (distinguished from advection).
- the act of conveying or transmitting.
Origin of convection
- a process of heat transfer through a gas or liquid by bulk motion of hotter material into a cooler regionCompare conduction (def. 1)
- meteorol the process by which masses of relatively warm air are raised into the atmosphere, often cooling and forming clouds, with compensatory downward movements of cooler air
- geology the slow circulation of subcrustal material, thought to be the mechanism by which tectonic plates are moved
Word Origin and History for convectional
- Heat transfer in a gas or liquid by the circulation of currents from one region to another.
- Fluid motion caused by an external force such as gravity.
- Current in a fluid caused by uneven distribution of heat. For example, air on a part of the Earth's surface warmed by strong sunlight will be heated by contact with the ground and will expand and flow upward, creating a region of low pressure below it; cooler surrounding air will then flow in to this low pressure region. The air thus circulates by convection, creating winds. See Note at conduction.
The motion of warm material that rises, cools off, and sinks again, producing a continuous circulation of material and transfer of heat. Some examples of processes involving convection are boiling water, in which heat is transferred from the stove to the air; the circulation of the atmosphere of the Earth, transferring heat from the equator to the North Pole and South Pole; and plate tectonics, in which heat is transferred from the interior of the Earth to its surface.