Question

why the sky appear blue?​

Answer 1

Answer:

Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky

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Answer 2

Blue of the clear sky : The blue colour of the sky is due to the scattering of the sunlight by the molecules of the atmosphere. The molecules of air , such as N2 and O2 , have sizes smaller than the wavelength of visible light. As sunlight passes through the atmosphere these molecules absorb some amount of sunlight and re-emit it. They scatter blue light of shorter wavelength more strongly than red light of longer wavelength . When we look at the sky, the scattered light enters our eyes and this light contains blue light in a larger proportion. That is why, the sky appears blue.