In physics of blackbody is considered an ideal system which has fulfilled the following properties:

· Any surface cannot emit more energy like a blackbody in case of fixed parameters (temperature and wavelength).

· The intensities of the various wavelengths of energy emitted by a black body depend only on its temperature. At normal temperature, a blackbody does not reflect any light and thus appears black totally.

· A blackbody system absorbs the radiation of all incident wavelengths which are falling on its surface.

In Figure 2 can be seen a black box which can be considered to be a blackbody system.

Since it is a theoretical model and any surface cannot perform the properties of a perfect blackbody we may find in reality only

            "Almost perfect black bodies".

 

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For more information, and also for a visible view of this you can have a look here http://www.youtube.com/watch?v=IQvJ4gHs_sg&feature=related