Physistri

Air does affect light,but not much,so it seems invisible.First reason is that the average air molecule is about 1 nm across,while light waves are on the order of 500 nm across. Hence,light continues its way not being affected.Another reason is that atoms are widely spaced where light pass through, since it has a small chance of interacting with air .However,if there is a lot of air,light can affect molecules in a phenomenon called “scattering “ later we will discuss it in the question ‘Why is the sky blue ?’