What is thermal radiation?

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Thermal radiation is electromagnetic radiation emitted by any matter having temperature greater than zero.

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Examples of thermal radiation include the visible light and infrared light emitted by an incandescent light bulb, the infrared radiation emitted by animals and detectable with an infrared camera, and the cosmic microwave background radiation.

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Thermal radiation, process by which energy, in the form of electromagnetic radiation, is emitted by a heated surface in all directions and travels directly to its point of absorption at the speed of light; thermal radiation does not require an intervening medium to carry it.

I would like you to check this websites for more info:
#1.#Hyperphysics
#2.#Britannica

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