And why and how does it represent heat unlike other wavelengths of light?
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Infrared is merely light that our eyeballs did not evolve to detect. The frequency is too low. Much like a frequency of sound that is too low to hear. Otherwise, it acts just like any other frequency of light.
Infrared light happens to be able to impart its energy to things very well without bouncing off or being so energetic it destroys them (See UV-C). When this happens, this energy is perceived as “heat” as “heat” is a measure of energy in a system.
There is only “hot” and “not hot.” “Cold” is the absence of heat. That is, the absence of energy in a system.
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