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- Infrared radiation | Definition, Wavelengths, Facts | Britannica
Infrared radiation, that portion of the electromagnetic spectrum that extends from the long wavelength, or red, end of the visible-light range to the microwave range Invisible to the eye, it can be detected as a sensation of warmth on the skin Learn more about infrared radiation in this article
- What Is Infrared? - Live Science
Infrared radiation is a type of electromagnetic radiation It is invisible to human eyes, but people can feel it as heat
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