The sky appears blue primarily due to a phenomenon called Rayleigh scattering.
Why is the sky blue
When sunlight reaches the Earth's atmosphere, it encounters molecules and particles in the air. These molecules, especially nitrogen and oxygen, scatter sunlight in all directions.
However, shorter wavelengths of light, such as blue and violet, are scattered more effectively than longer wavelengths like red, orange, and yellow.
As sunlight travels through the atmosphere, the shorter blue wavelengths scatter more widely in all directions, making the sky appear predominantly blue to an observer on the ground.
Correct question
Why is the sky blue