Why is the sky blue?

People always yearn for the blue sky, and know that often looking up at the blue sky will feel very happy, but they do not know why the sky is blue. It was not until 1900 that British physicist Lord Rayleigh discovered the Rayleigh scattering law, which explained why the sky is blue.

What is Rayleigh Scattering?

Rayleigh scattering is the scattering of an incident beam of light by tiny particles (such as individual atoms or molecules) with a radius much smaller than the wavelength of light or other electromagnetic radiation. Rayleigh scattering occurs when light passes through both transparent solids and liquids. In the atmosphere, the Rayleigh scattering of sunlight causes diffuse sky radiation, so we see the sky not only blue, but with a bottomless depth.

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