Why is the Sky Blue?

Light has different wavelengths, and visible light ranges between 400 nm to 750 nm.

Short wavelengths have the most energy, violet has the shortest wavelength of all the colors, and then blue.

The shorter the wavelength, the more chance it has to collide with oxygen or nitrogen molecules in the air.

This means that more violet and blue light is spread across the sky. Light is refracted off the molecules.

You might be asking why is the sky not violet then. This is because the human eye is more sensitive to blue light than violet light. Also, there is generally more blue light coming into the atmosphere than violet.

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