2.3. Radiation Transfer
Radiation is an original mode of transfer specific to thermal energy. A heated particle emits electromagnetic radiation in all directions. When this radiation strikes an object, the object can reflect a portion of it and absorb another portion as heat, which it will use to increase its temperature. This type of heat transfer is analogous to the propagation of light and does not require any material medium, unlike the first two modes of transfer. Gases, liquids, and solids are capable of emitting and absorbing thermal radiation.
Example :
The heat received by the Earth from the Sun is achieved through radiation.
