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Definition of Convection

Babylon English Dictionary

circulation of heat; thermal conduction, transmission of heat by circulatory movement in a fluid or gas that results in areas of different temperatures and distinctive densities which rise and fall in reaction to gravity (Physics); conveying, act of transmitting, act of transporting; (Meteorology) upright movement of heat in enormous motion inside the atmosphere
Convection Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The act or process of conveying or transmitting.
  
(n.)
A process of transfer or transmission, as of heat or electricity, by means of currents in liquids or gases, resulting from changes of temperature and other causes.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
WordNet 2.0

Noun
1. the transfer of heat through a fluid (liquid or gas) caused by molecular motion
(hypernym) temperature change
2. (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere
(hypernym) natural process, natural action, action, activity
(derivation) convect
(classification) meteorology
Convection Definition from Science & Technology Dictionaries & Glossaries
Electrochemistry Dictionary
"A mass-transport mechanism that involves bulk movement of a solution (contrast with diffusion that involves individual molecules or ions). We differentiate ""forced"" convection from ""natural"" convection. The simplest example of forced convection is mechanical stirring. If a non-uniform solution is stirred, the solute is ""transported"" from the high concentration parts of the solution to the low concentration parts till the solution becomes completely uniform. Other examples of forced convection are the ""flow"" of a solution through a pipe or a porous separator driven by pressure difference. ""Natural"" convection is very important in electrochemistry. It always occurs at the surface of an electrode carrying current in the absence of ""forced"" convection. As electrode reaction is proceeding, the buildup of reaction products and the consumption of reactants changes the density of the solution layer close to the electrode surface compared to that of the bulk solution. Eventually, this density difference will force the surface solution layer to sink or rise, setting up a ""natural stirring"" action close to the electrode surface which will tend to equalize the surface and bulk concentrations. As a ""rule of thumb,"" natural convection starts after about a minute of current flow. "
Energy Glossary
Transferring heat by moving air, or transferring heat by means of upward motion of particles of liquid or gas heat from beneath.
Electronics Terminology
The transfer of heat by movement of hot air. (Often used in conjunction with infrared radiation to reduce the effect of IR shadowing. )
WEATHER&METEOROLOGY
Motions in a fluid that transport and mix the properties of the fluid. These properties could be heat and/or moisture. When used to imply only upward vertical motion, it is then the opposite of subsidence.
A COMPREHENSIVE GLOSSARY OF WEATHER
Generally, transport of heat and moisture by the movement of a fluid. In meteorology, the term is used specifically to describe vertical transport of heat and moisture, especially by updrafts and downdrafts in an unstable atmosphere. The terms "convection" and "thunderstorms" often are used interchangeably, although thunderstorms are only one form of convection. Cbs , towering cumulus clouds, and ACCAS clouds all are visible forms of convection. However, convection is not always made visible by clouds. Convection which occurs without cloud formation is called dry convection, while the visible convection processes referred to above are forms of moist convection.
Dictionary of Automotive Terms
The transfer of heat from one object to another when the hotter object heats the surrounding air and the air in turn heats the other object.
Technical English by wpv
1. The circulatory motion that occurs in a fluid at a non-uniform temperature owing to the variation of its density and the action of gravity. 2. The transfer of heat by this automatic circulation of fluid.
NCRS Construction Glossary
A method of transferring heat by the actual movement of heated molecules, usually by a freestanding unit such as a furnace.
Astronomy and Physics Terms by ExploreSpace.com
Fluid circulation driven by temperature gradients; the transfer of heat by this automatic circulation (see also Educator's Guide to Convection).
Solar Physics Glossary
The physical upwelling of hot matter, thus transporting energy from a lower, hotter region to a higher, cooler region. A bubble of gas that is hotter than its surroundings expands and rises. When it has cooled by passing on its extra heat to its surroundings, the bubble sinks again. Convection can occur when there is a substantial decrease in temperature with height, such as in the Sun's convection zone .
Convection Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Convection is the concerted, collective movement of groups or aggregates of molecules within fluids (e.g., liquids, gases) and rheids, either through advection or through diffusion or as a combination of both of them. Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids. Diffusion of heat can take place in solids, but that is called heat conduction. Convection can be demonstrated by placing a heat source (e.g. a Bunsen burner) at the side of a glass full of a liquid, and observing the changes in temperature in the glass caused by the warmer fluid moving into cooler areas.

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Convection Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
(1) (Physics) Heat transfer in a gas or liquid by the circulation of currents from one region to another; also fluid motion caused by an external force such as gravity. (2) (Meteorology) The phenomenon occurring where large masses of warm air, heated by contact with a warm land surface and usually containing appreciable amounts of moisture, rise upward from the surface of the earth.
Convection Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
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Convection Definition from Religion & Spirituality Dictionaries & Glossaries
Webart Magic Astronomical Glossary
The physical upwelling of hot matter, thus transporting energy from a lower, hotter region to a higher, cooler region. A bubble of gas that is hotter than its surroundings expands and rises. When it has cooled by passing on its extra heat to its surroundings, the bubble sinks again. Convection can occur when there is a substantial decrease in temperature with height, such as in the Sun's convection zone. One of three modes of transmission of heat (energy) from hot regions to cold regions; involves motions of masses of material