Convection of heat

The mode of transference of heat energy within the heated medium by the movement of the substance itself.
The movement within the heated medium takes place in the form of currents, whereby a hot current of liquid or gas moves upwards and its place is taken by a cold current of liquid or gas moving downwards.
As the cold currents move downwards so the freezing chest is located at the top of the food compartment of the refrigerator.
Radiation is a process of transmission of heat from one body to another without heating the intervening medium or even in the absence of the intervening medium.

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