In which method of heat transfer, medium is not necessary?
In the method of heat transfer known as radiation, a medium is not necessary. Radiation involves the transfer of heat energy through electromagnetic waves, such as light and infrared radiation, that can travel through a vacuum, such as space. Unlike conduction and convection, which require a material medium, radiation can occur in empty space.
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The correct answer is [C] Radiation. In the method of heat transfer known as radiation, a medium is not necessary. Radiation involves the transfer of heat energy through electromagnetic waves, such as light and infrared radiation. Unlike conduction and convection, which require a material medium, radiation can occur even in a vacuum, such as outer space. This is because electromagnetic waves can propagate through empty space without the need for any material substance to carry them. Therefore, radiation is the only method of heat transfer where a medium is not required for the transmission of heat energy. Conduction involves the transfer of heat through direct contact between particles in a material medium, while convection involves the transfer of heat through the movement of fluid particles within a medium. However, radiation can occur independently of any material medium, making it unique among the three methods.