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Radiant heat needs no medium, it is nothing more than long wavelength light... infrared light as a matter of fact. This is the heat you get on your skin when standing out in the noon day Sun. Further, as the meteorologist indicated, a lot of Earth's heat comes from absorbed electro magnetic energy from the Sun that is turned into lower frequency, infrared energy that is radiated back into the atmosphere.

The heat requiring a medium is convection and conduction heat. Convection is where the air moves about distributing the heat it contains. Your central house heater does this when its fan blows. Conduction is where the heat is transferred in solids, like between the burner of your electric stove and the bottom of the fry pan on top of that burner.

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13y ago

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