| 单词 | convection |
| 释义 | convection (once / 49871 pages) n Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down. Convection is a major factor in weather. The sun heats the earth’s surface, then, when cooler air comes into contact with it, the air warms and rises, creating an upward current in the atmosphere. That current can result in wind, clouds, or other weather. Convection currents within the earth move layers of magma, and convection in the ocean creates currents. Convection ovens use fans to circulate heat so that whatever you're cooking cooks faster and more evenly. WORD FAMILYconvection: convections+/convect: convected, convection USAGE EXAMPLESAs Earth cooled after its formation, mantle convection may have slowed. Nature(Nov 01, 2016) Much of the energy absorbed by the composite was being swept away by convection, heat lost to the air moving above the beaker. Science Magazine(Aug 22, 2016) Whether the resulting conductivity is consistent with a geodynamo driven by thermal convection requires further detailed calculations; the results will be reported elsewhere. Nature(Apr 12, 2016) 1n the transfer of heat through a fluid (liquid or gas) caused by molecular motion Hyper temperature change a process whereby the degree of hotness of a body (or medium) changes 2n (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere Hyper action, activity, natural action, natural process a process existing in or produced by nature (rather than by the intent of human beings) |
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