American Heritage® Dictionary of the English Language, Fourth Edition
- n. The act or process of conveying; transmission.
- n. Physics Heat transfer in a gas or liquid by the circulation of currents from one region to another.
- n. Physics Fluid motion caused by an external force such as gravity.
- n. Meteorology The transfer of heat or other atmospheric properties by massive motion within the atmosphere, especially by such motion directed upward.
Century Dictionary and Cyclopedia
- n. The act of carrying or conveying; specifically, the transference of heat or electricity through the change of position of the heated or electrified body: distinguished from conduction (which see). When a portion of a liquid or a gas is heated above the temperature of surrounding portions, it increases in volume, and, thus becoming specifically lighter, rises, while the cooler portions of the fluid rush in from the sides and descend from the upper parts of the vessel. Convection currents are thus produced, and the liquid or gas is soon heated throughout. This principle is used in heating a house by a hot-air furnace. The Gulf Stream is a grand convection current, carrying the heat of the equator toward the pole. (See
heat.) Similarly, electricity may be transmitted by convection by the motion of the electrified body itself, as when the electricity of a conductor is discharged by a point, it being carried off by a stream of electrified air-particles.
- n. by liberation of the latent heat of evaporation which remains with the aqueous vapor contained in the air until it is liberated by condensation into cloud. In so far as the liberated heat remains in the cloud, it may be consumed in reëvaporating the cloudy particles or be lost by radiation; in so far as it is brought down to the earth with the rain or snow, it affects the local climate powerfully.
- n. The process of conveying something.
- n. physics The transmission of heat in a fluid or gas by the circulation of currents.
- n. 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.
GNU Webster's 1913
- n. The act or process of conveying or transmitting.
- n. (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.
- n. the transfer of heat through a fluid (liquid or gas) caused by molecular motion
- n. (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere
- From Latin convectionem, from convectio ("act of carrying"), from convect-, past participle of convehere ("to carry together"), combination of com- and vehere. (Wiktionary)
- Late Latin convectiō, convectiōn-, from convectus, past participle of convehere, to carry together : Latin com-, com- + Latin vehere, to carry. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The term convection is often used to describe heat transfer that ccurs between a object and a fluid flowing across it.”
“Bubbles of air will begin to rise if they are warmer than the surrounding air – this is known as convection.”
“Sunspots are areas of intense magnetic power where thermal convection from the interior of the Sun has been inhibited.”
“Controlling convection is much more effective, in which case, a thin barrier of an inert gas such as CO2 works well.”
“-- Heat is transmitted through the air by what is called convection, that is, the particles of the air transmit it from one point to the next.”
“It's so hot that it makes a kind of fire weather called a convection column.”
“Place the cookie sheets in the freezer for, according to Martha, at least 15 minutes, until firm (I had an appointment so mine were in the freezer for 2 hours). 15 minutes before baking, preheat the oven to 350 F (325 F for convection, which is what I used).”
“Atmospheric circulation involves thermo-gravitational convection, which is inherently instable and in rotating frame of reference generates hurricanes and tornadoes.”
“The sun's dynamo originates in or just below what's called the convection layer, the outer 30 percent of the star, where hot gases rise as cool ones sink.”
“If you include convection, which is strictly a loss from the surface, the temperature would go even lower.”
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