define convection of heat
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Explanation:
Convection is the heat transfer due to the bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid). Convection includes sub-mechanisms of advection (directional bulk-flow transfer of heat), and diffusion (non-directional transfer of energy or mass particles along a concentration gradient).
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it is mainly happened in the liqiuds and gases. heat is transfered from hot places to cool places as liqiuds and gases expand on heating them
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