The atmosphere itself is colorless. The blue of the sky is a picture created by atmospheric molecules, ice crystals and water droplets. Sunlight is broad spectrum, including from infrared to visible light, from visible light to ultraviolet light. Its energy is concentrated in visible light centered on yellow light. In other words, the true colors of sunlight are yellow and white.
Air scatters light passing through it. When sunlight enters the atmosphere, long-wavelength colored light, such as red light, has great transmission power and can penetrate the atmosphere and shoot to the ground; Some light passing through the air will deviate from the original direction of motion and leave the original beam, and the shorter the wavelength of light (light with short wavelength corresponds to blue light and light with long wavelength corresponds to red light), the greater the scattering effect. However, violet, blue and cyan light with shorter wavelength will easily scatter when it touches atmospheric molecules, ice crystals and water droplets. Purple, blue and cyan light scattered in the sky. When sunlight passes through the air, blue light scatters more and red light scatters less. It makes the sky look blue, which is why the sky is blue.
2. Clouds in the sky are composed of water droplets and dust in the air. Their diameters are much longer than the wavelength of sunlight of any color, so Rayleigh scattering rarely occurs. Part of the sunlight is reflected into the air; Part of it is scattered by Michael, and then the scattered light hits the earth, but Michael scattering does not change any color of sunlight; Some directly penetrate the gaps between water droplets. The above three conditions have no effect on the composition of sunlight, so it seems that the clouds in the sky are white. But the clouds are getting thicker and thicker, and there are more and more water droplets, which are almost connected. Sunlight and scattered light cannot or rarely penetrate clouds, so white clouds become dark clouds.
In short, it is in the process of sunlight incident on the earth's surface through the atmosphere that air molecules or other particles in the atmosphere will absorb, reflect and transmit sunlight, thus forming the brilliant afterglow and sunrise of blue sky, white clouds and sunset. If there is no atmosphere and other particles, even during the day, the sun looks like a solitary bright ball, and the sky will be dark, so the air not only provides us with living conditions, but also makes our sky colorful.
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The sky is blue and the clouds are white.
Get up early, the sky facing the sun is blue, with white clouds passing by, very white clouds. I began to be busy in the fireworks, washing clothes, cooking and cleaning the house. After I freshen up, I will go to work in half an hour. Read some pages. Pick up the second phase of Hu Fen 20 18 and enter another world. Read the frontispiece Origin, from Lihua Village to Lihua Village again, and give yourself a smile. After reading on, Jin Qing's Hometown Couplet Book came into view, probably because the words related to homesickness, homesickness and homesickness would feel more cordial, so I couldn't wait. However, if you walk between the lines of Jin Qing, even your breathing will slow down. Follow her rhythm and taste slowly. Her love for her hometown is vivid and admirable. She said that although metropolises have unique material advantages, they have more employment choices, higher incomes and even higher quality of life. However, the fast-paced atmosphere in the metropolis and the cold faces between people make people breathless ..... This reminds me of the topic we discussed with our manager the other day: Shanghai applicants basically fill in the column of hobbies, such as traveling and fitness. The hobbies of little girls in Hu Fen are reading, drawing, practicing calligraphy and watching movies. Indeed, more than 80% of the girls who come to apply every morning like reading, and their tone of voice is awkward and soft, and they exude a book. Yes, the fast-paced work, life and breathing in the city are all difficult. Travel naturally becomes the best choice for temporary relaxation and thinking, while fitness can vent the backlog of emotions. But Hufen Lake is different. The bridges are gentle and the pavilions are leisurely. It has a strong cultural background. After staying for a long time, there will naturally be ink fragrance ... put down the book and look out the window. The sky is blue and the clouds are white.
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Why is the sky blue? Why are clouds white?
Because the sea is blue, it is easy to understand how clouds are formed if we know evaporation, sublimation, condensation and sublimation. Water in oceans, lakes, plant surfaces and soil has been evaporating, turning into steam and entering the atmosphere. For some reason, moist air containing water vapor rises. In the process of rising, because the surrounding air is thinner and thinner, the air pressure is lower and lower, and the rising air volume will expand. When expanding, it consumes its own heat, so the temperature of the rising air should be reduced. As the temperature drops, the ability to contain water vapor becomes smaller and smaller, the saturated water vapor pressure decreases, and the water vapor in the rising air quickly reaches saturation. When the temperature drops again, the excess water vapor adheres to the condensation nuclei suspended in the air and becomes small water droplets. If the temperature is lower than 0℃, excess water vapor will condense into ice crystals or supercooled water droplets. They gather together and float in the air under the support of updraft, becoming clouds that we can see.
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