It is a phenomenon that consists in the deviation of light or another form of radiation.
When, for example, a sunbeam penetrates a room in which dust particles are suspended, the light is deflected in all directions or diffused. The same happens if a sheet of white paper is illuminated.
However, there is diffusion of light into transparent elements without any impurity. For example, if we consider a portion of Earth's atmosphere lacking medium-large particles, the diffusion of light is produced by the air molecules themselves. In this case, by Raleigh's law of absorption, it is found that the most diffused light is blue, while red is the least (selective absorption).
Also the molecules of a gas can become centers of diffusion and this is the reason why the sky, on a serene day, appears blue.
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