Why the sky is blue?

Why the sky is blue?

The sun not only gives us light and heat, but also to paint all around us in the rainbow colors of the spectrum. white light beam actually colorful, that we know of his reflection in a drop of rain, which has become a rainbow. Then why is the sky for the sun to choose exactly the color blue, not green, for example? Although it is difficult to imagine a green sky.

Earth is surrounded by a layer of air that we breathe. It is oxygen, ozone and carbon dioxide. This layer is called the atmosphere. Outside layer thickness of about 500 kilometers. It provides the air we breathe.

Why the sky is blue?

The air consists of molecules in which light can not be reflected. He scattered them. The electrons in a molecule are subject to the impact of incident sunlight and begin to radiate. And the light is scattered at the same time. And this scattered light we see from Earth.

Gases in the air, divided light on the known colors of the spectrum. We know them well know - red, orange, yellow, green, blue, indigo, violet. But the sky we most often see blue or blue. Why the sky is blue?

Why the sky is blue?

Then the law comes into force dissipation, open Rayleigh, in which light with a smaller wavelength dissipated faster than the waves of light with a longer length. In blue, blue and purple colors of the spectrum wavelengths less. Therefore, it is their diffuse light we see in the sky.

Why the sky is blue?

Some of the colors of the spectrum with a longer wavelength, such as red and orange little scattered. At sunset, the atmosphere layer is increased many times over, the spectrum is more difficult to pass through it, and since blue and blue colors were scattered, they have less celestial palette of colors in the evening, one color remains intact - red. Here it is what we see in the sky at sunset. And the sun itself appears to us then red. Of course, in other parts of the world the sky at the moment is blue, there are scattered short rays of the spectrum.

By morning, the sun comes back to us, if he did not have to break through a thick veil of clouds and clouds. Then we see the sky in the clouds. But that's another story.