What do we mean when we say gas molecules in air scatter sun light (more blue)?
Do they reflect sunlight? Is beam of sunlight falling on one molecule and each rays got reflected into different random angles (specially blue color)?
Or a ray hit on a molecule got reflected in one direction?
What actually is happening?
In scattering of light sunlight is absorbed and re-emitted by air molecules $$I\propto\frac{1}{\lambda^4}.$$ Since blue light has lower wavelength in the visible range it scatters the most. The actual phenomenon is caused due to electric polarization of gases. The electric field in light causes the molecules to vibrate at the same frequency of light. This causes the formation of radiating dipoles. These dipoles emits radiations which we see as scattered light.
