eli5 why is the infra red part of the spectrum warm?
In: 3
Water absorbs those wavelengths very well and that’s what you’re made of. The visible spectrum is actually a gap where wavelengths of light pass through relatively easily. The ultraviolet end also gets absorbed.
The difference between the two is that IR gets the water molecule wiggling faster and increased molecular speed is what we performed as heat. UV photons carry enough energy to break chemical bonds and damage the cells but don’t speed them up by much and this don’t feel hot.
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