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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| 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. Researchers who study the chemistry of lavas, however, argue that the mantle resembles a double boiler, with separate upper and lower layers that each have their own systems of convection currents. But on top of this essentially humdrum parti are swooping glass roofs that can both capture solar energy and use it to generate convection currents to ventilate the spaces. |
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