Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids. Diffusion of heat can take place in solids, but is referred to separately in that case as heat conduction.
A good model for convection is when you take a heat source and place it at any side of a glass full of a liquid, you then can feel the different levels of heat in the glass. Convective heat transfer is one of the major modes of heat transfer and convection is also a major mode of mass transfer in fluids.
Convective heat and mass transfer take place through both 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. Note that 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", 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 properly qualified for clarity. Transmission of energy or mass by a medium involving movement of the medium itself. The circulatory movement that occurs in a fluid at a nonuniform temperature owing to the variation of its density and the action of gravity. Meteorology Natural Process Temperature Change. Scientists track lightning because it is a marker of convection , the turbulent mixing process that transports Jupiter's internal heat up to the visible cloud tops, ongoing studies of lightning sources will help us understand how convection on Jupiter is different from or similar to convection in the Earth's atmosphere.
When dust veils like this occur, they tend to put a lid on atmospheric convection over areas favorable for tropical storm development, add to this the impact of the El Nio, which favors stronger-than-average winds across the Atlantic basin-- which tend to shear apart any rising motion -- and you have a recipe for a below-average hurricane season.
Our observations suggest a ball of gas illuminated from the interior, with rays of warm light swirling through stormy patches of dark clouds, convection moves around the clouds of silicate and iron particles, which disaggregate and rain down into the interior.
This paints a picture of a dynamic atmosphere of a giant exoplanet at birth, undergoing complex physical and chemical processes. Convection models were good for the mantle, but not plates, and plate tectonics was good for plates but not the mantle, and the whole story behind the evolution of the system is the feedback between the two.
So if there's a Saharan dust outbreak, there's more likely going to be a greater temperature contrast between the Saharan desert and the Sahel region that will increase the convection activity in the ITCZ. We're doing our best to make sure our content is useful, accurate and safe. If by any chance you spot an inappropriate comment while navigating through our website please use this form to let us know, and we'll take care of it shortly.
Forgot your password? Retrieve it. If by any chance you spot an inappropriate image within your search results please use this form to let us know, and we'll take care of it shortly. Term » Definition. Word in Definition. Princeton's WordNet 2. This is illustrated by the seasonal variation in convection. In summer, when the gradient is steepest, convection reaches its maximum.
In the part BNA, the electricity is carried by a moving conductor; it is said to be displaced by convection. The motion of warm material that rises, cools off, and sinks again, producing a continuous circulation of material and transfer of heat. Some examples of processes involving convection are boiling water, in which heat is transferred from the stove to the air; the circulation of the atmosphere of the Earth , transferring heat from the equator to the North Pole and South Pole ; and plate tectonics , in which heat is transferred from the interior of the Earth to its surface.
New Word List Word List. Save This Word! See synonyms for convection on Thesaurus. We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms. Word of the Day kind-hearted. About this. Blog Outsets and onsets! Read More. November 08, To top. English American Examples Translations. Sign up for free and get access to exclusive content:.
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