As a child, I wondered why the sky was blue

For example, the sky above you is blue, but where the horizon meets heaven and earth, the sky looks almost white. Why? That's because sunlight travels a lot farther through the air than it does if it falls straight from the sky—and it grazes with many more particles along the way.

These large numbers of microparticles scatter light many times, so it appears white and light blue. It is recommended that you do a little experiment to verify this: take a glass of water, put it in a dark background, put a drop of milk, and then take a flashlight to one end of the cup, and close to it, the light of the flashlight will appear pale blue in the water.

If you put more milk into the water, the whiter the water will become, because the light is scattered again and again by these numerous milk particles, and the result is white. It's the same as being white above the horizon.

Why is the sky blue? It's actually quite simple.

As we all know, sunlight is composed of seven colors: red, orange, yellow, green, blue, and violet, and these seven types of light gradually shorten in wavelength from red to violet. When the sun's rays hit the earth, the light passes through the thick atmosphere of the earth, and the light with long wavelengths (red, orange, yellow, green) passes through the atmosphere, while the light with short wavelengths (blue, blue, violet) is scattered by the atmosphere, so the sky is blue.

The concept of "wavelength" can be learned in junior high school physics.

The ocean is blue, so the sky reflects the color of the ocean! Interdependence and coexistence with each other.

The sky is, of course, blue, as the eye sees.

The blue color of the sky is due to the fact that when sunlight passes through the atmosphere, the shorter wavelengths of violet, blue, and cyan light are most easily scattered, while the longer wavelengths of red, orange, and yellow light are weakly scattered. (*Hee-hee.......)Clear?

Because it is necessary to set off the whiteness of the clouds.

Oh, that's it! Because the air is good, the weather is blue, like Guangzhou, which is smoky and miasma, and it is rare to see blue for a hundred years. Remember to cherish our Mother Earth, lest the next generation of children will ask, why is it dark, but the textbook says that the sky is blue.