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Conduction requires contact, radiation does not.
Radiation in regards to thermodynamics is the straight line (line of sight) transfer of heat from a hot body to a cold body with no intervening fluid to convey that heat. Example: a flame will heat an object some distance from it by radiation as long as the transfer of heat is unobstructed. Place an object between the two and this flow of heat will stop.
Conduction is the flow of heat between a hot body to a cold body by direct contact. Separate the two bodies and this flow of heat stops.
Note: transfer of heat by an intervening fluid is convection. The hot body heats the fluid, then the fluid heats the cold body. All three forms of heat transfer occur in most practical heating applications.
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