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Is thermal radiation = infrared radiation only?

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No. That's one of the most common misconceptions concerning physics. It's also something that puzzled me when I was young, and I was lucky to have been given books that described the history of thermodynamics that helped me to clarify this. read more

Thermal radiation can have any frequency at all; it depends on the temperature of the radiating body. However, most bodies in the universe have temperatures that make them emit most of their radiation in the visible or infrared part of the spectrum. read more

Examples of thermal radiation include the visible light and infrared light emitted by an incandescent light bulb, the infrared radiation emitted by animals that is detectable with an infrared camera, and the cosmic microwave background radiation. Thermal radiation is different from thermal convection and thermal conduction—a person near a raging bonfire feels radiant heating from the fire, even if the surrounding air is very cold. read more

Thermal radiation is electromagnetic radiation emitted from a material that is due to the heat of the material, the characteristics of which depend on its temperature. An example of thermal radiation is the infrared radiation emitted by a common household radiator or electric heater. read more

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