What does the blue sky look like?
The reason why the sky is blue is because the sun is composed of seven kinds of light. Among the seven types of light, the ones with shorter wavelengths are cyan, blue, and violet. The shorter wavelengths of light are the most easily scattered by air molecules and dust in the air. Therefore, most of the three types of light, cyan, blue, and violet, are scattered when sunlight passes through the atmosphere. Purple is almost invisible in the atmosphere because purple light is mostly absorbed while being scattered, and the human eye is not sensitive to violet.
The color of the sky (that is, the color of the atmosphere) is actually a composite of colors around the blue part of the spectrum, which we call "cerulean."
Extended information:
The sky has various forms of expression. It carries the light that is the fastest in human understanding. It is the most original creative enlightenment of human beings. It is ever-changing.
Various forms are usually expressed in terms of weather. Weather refers to the specific state of the atmosphere close to the surface in a certain place in a short period of time. Weather phenomena refer to various natural phenomena that occur in the atmosphere, that is, various meteorological elements in the atmosphere at a certain instant (such as temperature, air pressure, humidity, wind, clouds, fog, rain, flash, snow, frost, thunder, Hail, haze, etc.) spatial distribution comprehensive performance. Weather process is the process of changes of weather phenomena in a certain area over time.
Various weather systems have certain spatial and temporal scales, and systems of various scales are intertwined and interact with each other. The combination of many weather systems forms a large-scale weather situation and constitutes hemispheric or even global atmospheric circulation. Weather systems are always in the process of being reborn, developing and dying, and there are corresponding distributions of weather phenomena at different stages of development.
Reference: Baidu Encyclopedia: Sky