How is infrared different from other light?

Question

And why and how does it represent heat unlike other wavelengths of light?

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Answer 1

It’s just at a wavelength that doesn’t tickle our eye structures (rods/cones). The thing about heat is that any object that is above absolute zero in temperature will emit “blackbody radiation.” The more energy it has, the brighter the radiation. When looking at a human, our blackbody radiation is in the infrared part of the EM spectrum.

I knew it would be in the visible spectrum that we can see at a certain temp. I looked that up, and it’s called the Draper temperature, which is 798 Kelvin which is ~525C or 977F. Once an object is that temperature, we can see it glow. Yikes for Rudolph.