Look at the clouds and you will know what the weather means in "Clouds are like weather signs: what kind of weather will appear when clouds hang in the sky".

"Signboard" refers to a sign, which refers to the relationship between clouds and weather. Different clouds will have different weather.

Thin clouds in the sky are often a symbol of good weather; Those low and thick clouds are often signs of rain and snow, and the weather can be judged according to various signs. Although it is not very accurate, the proverb has been circulated for several generations, and then it was selected into the 22 nd lesson of the seventh grade Chinese published by People's Education Publishing House. This is a popular science article, written by Zhu Yongxi and read by Zijun.

Seeing the weather from the clouds is a popular science article. The author introduces the relationship between clouds and weather in logical order from two aspects with vivid language: the relationship between different forms of clouds and weather; The relationship between different glorious clouds and the weather. Structurally, the whole paper adopts the relationship of total-subtotal.

Extended data:

cloud formation

Cloud is a visible polymer suspended in the atmosphere, which consists of a large number of tiny water droplets, ice crystals and dust. Generally, if you don't touch the ground, it's called fog.

Because the atmospheric pressure decreases with the increase of height, the air will expand and cool down when it rises, and the saturated water pressure will also decrease. When the water in the air reaches saturation and condenses into a large number of tiny water droplets floating in the air, clouds are formed.