1. The act or process of conveying; transmission.
a. Heat transfer in a gas or liquid by the circulation of currents from one region to another.
b. Fluid motion caused by an external force such as gravity.
3. Meteorology The transfer of heat or other atmospheric properties by massive motion within the atmosphere, especially by such motion directed upward.
[Late Latinconvectiō, convectiōn-, fromconvectus, past participle ofconvehere, to carry together : Latincom-, com- + Latinvehere, to carry; see wegh- in the Appendix of Indo-European roots.]
(click for a larger image)convection
Air heated by a space heater rises and is replaced by cool air, creating a convection current that circulates hot air throughout a room.
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