Convection is the process of heat transfer in fluids (liquids and gases) by the actual movement of the fluid particles. Cold air is denser than warm air and sinks, while warm air is lighter and rises. By placing the cooling element at the top, the cooled air sinks, pushing the warmer air upwards towards the cooling element, setting up a continuous cycle (convection current) that cools the entire compartment.
The freezing chest in refrigerator is kept near the top because
Asked in WBPSC CS Prelims 2021 · Topic: Heat and Thermodynamics (Modes of Heat Transfer (Conduction, Convection, Radiation))
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