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And what about the issue of density fluctuations in the atmosphere?
Irrelevant for an ideal gas, according to Bohren and Fraser.
They claim that, since the molecular positions in an ideal gas
are uncorrelated, the total scattering rate is just N (the number
of molecules) times the molecular scattering rate. Jackson
(second edition, page 422) agrees. Density fluctuations are
important (they say) in liquids and high-density gases. I'm not
sure I fully understand this issue myself, though.