Editing Rayleigh scattering (section)

==From molecules==
[[File:Rayleigh sunlight scattering.svg|thumb|Figure showing the greater proportion of blue light scattered by the atmosphere relative to red light]]
The expression above can also be written in terms of individual molecules by expressing the dependence on refractive index in terms of the molecular [[polarizability]] ''α'', proportional to the dipole moment induced by the electric field of the light. In this case, the Rayleigh scattering intensity for a single particle is given in [[Centimetre–gram–second system of units|CGS-units]] by<ref>[http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html#c2 Rayleigh scattering]. Hyperphysics.phy-astr.gsu.edu. Retrieved on 2018-08-06.</ref>
<math display="block">I_s = I_0 \frac{8\pi^4\alpha^2}{\lambda^4 R^2}(1+\cos^2\theta)</math>
and in [[International System of Units|SI-units]] by
<math display="block">I_s = I_0 \frac{\pi^2\alpha^2}{{\varepsilon_0}^2 \lambda^4 R^2}\frac{1+\cos^2(\theta)}{2} .</math>