Thursday, 28 December 2017

visible light - Why is air invisible?



I think that something is invisible if it's isolated particles are smaller than the wavelength of visible light. Is this correct?


Why is air invisible? What about other gases and fumes which are visible?



Answer



I think the pithy answer is that our eyes adapted to see the subset of the electromagnetic spectrum where air has no absorption peaks. If we saw in different frequency ranges, then air would scatter the light we saw, and our eyes would be less useful.


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