Thermal radiation is one kind of electromagnetic radiation that produce from thermal motion of atoms charged particles. Infrared light and visible light is the most common example of thermal radiation which is emited by incandanscent bulb.
Infrared radiation is also emited by animals. The radiation emited by animals is detected by infrared camera.
Thermal radiation is different from thermal convection and thermal conduction. Near of a fire a people radiates infrared light even if surrounding him is very cold.
Sunlight is a part of thermal radiation, though it is also considered as electromagnetic radiation. Thermal radiation of sun produces by the plasma of sun.
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