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Anonymous users2024-02-07It's obviously the scattering of the atmosphere.
There are seven colors in sunlight: red, orange, green, yellow, blue, indigent, and violet. Red light is the strongest, orange, yellow, and green are also stronger, and the weakest are blue, yellow, and violet.
When the sunlight penetrates the thick atmosphere, the red light runs the fastest and passes through it at once; followed by orange, yellow, and green lights; Most of the blue and indimorphic light is detained by the atmosphere.
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Anonymous users2024-02-06No, since the destruction of the people has turned gray, there is rarely a time for blue.
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Anonymous users2024-02-05The reason is simple, the scattering of sunlight by the atmosphere makes the sky appear blue as we see.
The Earth's surface is surrounded by an atmosphere, and when sunlight enters the atmosphere, air molecules and particles (dust, water droplets, ice crystals, etc.) scatter sunlight around. Sunlight is composed of seven kinds of light: red, clear, yellow, green, blue, indigo, and violet, with red light having the longest wavelength and violet light having the shortest wavelength. Red light with a longer wavelength is the most transmissible, and it can directly penetrate particles in the atmosphere to the ground.
Blue, indigo, violet and other colors with shorter wavelengths are easily scattered by particles in the atmosphere. In the shortwave band, blue light has the most energy and scatters the most light waves, so the sky we see appears blue.
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Anonymous users2024-02-04On a cloudless sunny day, the sky is mostly blue. But if you look closely, the color is also changing all the time, sometimes darker, sometimes whitish. Why is that?
As you know, there are many tiny dust and water droplets floating in the air, which can disperse the mixed light of the sun, which is called "scattering" in optics. The dust in the air is related to the scattering ability of water droplets and the length of light waves, and the shorter the wavelength of light, the greater the scattering ability. Among the sun's mixed light, violet light has the shortest wavelength and the greatest scattering ability.
When the sun's rays enter the atmosphere, the first scatter is violet light. However, the violet light is scattered before it reaches the ground, and there is very little violet light close to the ground, while blue light is the most, so we see the sky blue from the ground and gradually turn purple at high altitude.
If there are a lot of large water droplets and fine dust in the air, it can also scatter yellow, red, green and other colors of light with a long wavelength, so sometimes the color of the sky is a little whitish. Around noon, the sun's rays hit the ground directly, and through the thinner layer of air, the blue light is easily scattered, so the sky is blue. If it is in the evening or morning, because the sun is oblique to the ground, through a thick layer of air, the blue light is scattered before reaching the ground, while the red and orange light is scattered on the ground, so the sky will be white, and sometimes there will be a rainbow glow.
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