Convection Current


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convection current

[kən′vek·shən ‚kər·ənt]
(electronics)
The time rate at which the electric charges of an electron stream are transported through a given surface.
(geophysics)
Mass movement of subcrustal or mantle material as the result of temperature variations.
(meteorology)
Any current of air involved in convection; usually, the upward-moving portion of a convection circulation, such as a thermal or the updraft in cumulus clouds. Also known as convective current.

Convection Current

 

the transfer of electric charges by the movement of a charged macroscopic body. From the viewpoint of electron theory, any transfer of charges is, in the final analysis, due to the convection (or movement) of charged microparticles. This explains the complete identity between the magnetic properties of convection current and a conduction current (that is, the ordered movement of electrons, ions, and other particles relative to a body), which was established by the experiments of the American physicist G. Rowland (1879) and the Russian physicist A. A. Eikhenval’d (1903).

convection current

The transfer of heat that results from the movement of air from one location to another, usually as a result of a stream of air produced by thermal convection caused by differences in temperature.
References in periodicals archive ?
Effects of mass transfer and free convection currents on the flow past an impulsively started vertical plate, J.
From the present numerical investigation we observed that velocity profiles decrease with the increase of permeability parameter while it increases with the increase of free convection currents.
Only the details of the local densities, temperatures, composition, opacities, radiative emission, and convection currents, are altered.
Before their data streams of convection currents and computer modelling of pressure differentials, weather forecasters would present their prognostications in far more dogmatic fashion.
Indeed, convection currents in the mantle are responsible for most of the volcanic and tectonic processes that we see at Earth's surface.
Then somebody at the table next to you lights up a cigarette and the convection currents happen to be flowing in your direction.
In certain areas of a glass oven door, convection currents between the layers of glass are minimized or eliminated in order to avoid excessive temperatures on the outer surface of the door.
This primary structure carries purlins and rafters in the normal way, with the rafters strutted at the same angle as the struts on the tied portals, creating in effect an inverted ridge that acts as a continuous lantern because, above it, the real ridge is defined by a motorized greenhouse glazing system that can be thrown open on hot days to encourage cooling convection currents.
In addition, temperature differences between day and night are small and so there are no convection currents to move the oxygen-rich surface layers to the deeper layers.
Natural convection currents are induced by forces due to differences in variations between the device surface temperature and the surrounding ambient temperature; that is, heat is directly picked up by the air and transported away.