Definition: Radiation is the continual emission of infrared waves from the surface of all bodies, transmitted without the aid of a medium
This means that energy is transported through space by electromagnetic waves.
Radiation involves waves to transfer thermal energy. It is possible even in a vacuum. That is how the heat from the Sun travels to the Earth. The Sun emits electromagnetic waves. These waves makes us feel warm. Thermal energy from infrared waves is called radiant heat.
The hotter the object, the greater the amount of radiant heat emitted.
All sources of heat radiate heat to a certain extent. Even human beings radiate heat to a certain extent.
Some factors affect the rate of infrared radiation, like:
1) Colour and Texture of the surface.
Black and dull surfaces absorb infrared radiation better than whte and shiny surfaces.
2) Surface Temperature.
The higher the temperature of the surface of the object relative to the surrounding temperature, the higher the rate of infrared radiation.
This means that there is a direct proportion between the surrounding temperature and the temperature of the object's surface.
3) Surface Area.
The larger the object is, the faster it will emit infrared radiation.
This means that the size of the surface area of the object is directly proportional to the rate of infrared radiation emission.
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