Why does the sky appear blue?

Sky appears blue due to the scattering of light. As light rays enter the earth it gets scattered by the dust particles present int he atmosphere. Light rays contains seven colours. VIBGYOR. VIolet, Indigo, Blue, Green, Yellow Orange and Red. Red having more wavelength reaches the horizon not beng scattered much whereas violet, indigo, blue being of shorter wavelength get scattered in the earths atmosphere.

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Blue rays of light are formed as the water droplets in the sky act as prisms for dispersion

The blue color of the sky is due to Rayleigh scattering.

As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.

As you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white.