what is mean by convection
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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. ... That current can result in wind, clouds, or other weather.
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the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise,and colder ,denser material to sink under the influence of gravity which consequently results in transfer of heat is known as convection.
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