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Radiation

Radiation is an energy transferred when electromagnetic waves travel through empty spaces. When

electromagnetic waves come in contact with an object, the waves transfer the heat to that object.
Radiation is a method of heat transfer that does not rely upon any contact between the heat source

and the heated object as is the case with conduction and convection. Heat can be transmitted though

empty space by thermal radiation often called infrared radiation. No medium is required in the
process of radiation. Examples of radiation are the heat from the sun, heat released from the filament
of a light bulb, campfire, electric heater, microwave oven.

Figure 1.14: Radiation is transferred by electromagnetic radiation

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