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Radiation doesn't require the use of a medium- think of the Sun, for example, which heats us despite there being nothing directly connecting us. Convection requires a medium- when you put something less hot in something hot, the heat moves from the hot thing to the less hot thing.
Examples of Radiation are: Heat from the sun or feeling heat from a fire. A convection example could be boiling water: heat passes from the flame into a pot which heats the water at the bottom, then the hot water rises and cooler water moves down, resulting in a circular motion.
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