And why and how does it represent heat unlike other wavelengths of light?
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“Infra-” means “below”. Infrared just means light that’s less energetic than visible red light.
> And why and how does it represent heat unlike other wavelengths of light
Everything that’s hotter than absolute zero gives off light. That’s why fire glows red or blue, and why metals glow when heated. It’s just very rare for things to actually get hot enough to glow visibly. And light that is less energetic than visible light is infrared, hence infrared is associated with heat.
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