Thermal radiation is a process by which energy in the form of electromagnetic radiation is emitted from all directions of a heated surface and it requires absolutely no form of medium for it to propagate. It represents the conversion of thermal energy into electromagnetic energy. Thermal energy consists of the kinetic energy of random movements of atoms and molecules in matter. The entire heating of the earth by the sun is an example of thermal radiation. The rate at which a body absorbs or radiates thermal energy depends mainly on the nature of the object. There are both good absorbers and good emitters. A good absorber is necessarily a good emitter, and a poor absorber is always a poor emitter. Our skin in is an excellent absorber and therefore it can absorb the entirety of the energy spectrum from higher wavelength radio waves to smaller wavelength gamma rays. 
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