What is convection heat transfer? Why is it considered to be a mode of heat transfer?

Convection heat transfer is a mode of heat transfer that occurs when a fluid, such as air or water, is in motion and transfers heat from one location to another. The motion of the fluid can be either natural or forced. Natural convection occurs when the fluid motion is caused by buoyancy forces, such as when a hot object heats _______ _______ _________ _____ ______ ____ _________.
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