Crossword clues for convection
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Convection \Con*vec"tion\, n. [L. convectio, fr. convehere to bring together; con- + vehere to carry.]
The act or process of conveying or transmitting.
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(Physics) 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.
Liquids are generally heated by convection -- when heat is applied from bellow.
--Nichol.
Douglas Harper's Etymology Dictionary
Wiktionary
n. 1 The process of conveying something. 2 (context physics English) The transmission of heat in a fluid or gas by the circulation of currents. 3 (context meteorology English) 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.
WordNet
n. the transfer of heat through a fluid (liquid or gas) caused by molecular motion
(meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere
Wikipedia
Convection is the movement of groups of molecules within fluids such as liquids or gases, and within rheids. Convection takes place through advection, diffusion or both.
Convection cannot take place in solids because 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 ghost fluid moving into cooler areas.
Convective heat transfer is one of the major types of heat transfer, and convection is also a major mode of mass transfer in fluids. Convective heat and mass transfer take place both by diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. In the context of heat and mass transfer, the term "convection" is used to refer to the sum of advective and diffusive transfer. In common use the term "convection" may refer loosely to heat transfer by convection, as opposed to mass transfer by convection, or the convection process in general. Sometimes "convection" is even used to refer specifically to "free heat convection" (natural heat convection) as opposed to forced heat convection. However, in mechanics the correct use of the word is the general sense, and different types of convection should be qualified for clarity.
Convection can be qualified in terms of being natural, forced, gravitational, granular, or thermomagnetic. It may also be said to be due to combustion, capillary action, or Marangoni and Weissenberg effects. Heat transfer by natural convection plays a role in the structure of Earth's atmosphere, its oceans, and its mantle. Discrete convective cells in the atmosphere can be seen as clouds, with stronger convection resulting in thunderstorms. Natural convection also plays a role in stellar physics.
Usage examples of "convection".
Convection carried incandescent gas and pumice clasts to a height of 28 km.
Convection carried incandescant gas and pumice clasts to a height of 28 km.
Drawing their palms over grass, goldenrod, and white alyssum, they walked toward the common line, fourteen of them, their yellow silk cassocks whipped by wind and fiery convections, the five snakes about each of their throats outstretched, like the spokes of a candelabra, searching every direction.
Causes become occasions of convections and confluences, places where the currents meet.
The spheres and contour lines imploded in sparkles of pixels, exposing the native panorama of the convective cavern, a complex, ghostly overlay of flux tubes, p-modes and convection cells.
But a fifth of the way down from the surface the pressure was lessened enough so that the gases could move about a bit—which is to say, convectively, and so it was called the convection zone.
But there would be nothing, beyond the increasing discordance of a craft being shattered by crude convection.
The mesoscale convection is shaping up, the Bermuda High, the jet stream.
The dust and raw melange were being sucked down, turned over by convection currents and chemical reactions.
The captain of the bridge gun crew sprayed the bore of his gun with compressed gas to allow convection cooling.
Orbiting twenty million kilometres ahead of the starships, a city was flying unperturbably above the slow-churning blooms of the convection currents which contoured the red giant’s surface.
With luck, it had reached the cloud wall and was sowing the rising leg of the convection cell with tons of reflective chaff.
At a distance of only 150 million kilometers, the sun had the power to boil oceans and set up vast convection cells.
Paul's captor, constructed of the Virtual particle sets of the seething vacuum, resembled its forebears - the odd, vast creatures who had spawned as constructs of convection cells in a boiling ocean - as a laser rifle resembles a piece of chipped stone.
In the convection zone Wan-To could cavort freely, letting himself be carried along by the convection cells when he chose, twisting their paths into amusing tangles when that seemed more interesting.