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为什么天空中的云有各zhong不同的颜美

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为什么天空中的云有各zhong不同的颜se?

各zhong云ti的厚薄相差很大,厚的可达七八千米,薄的只有几十米。很厚的层状云,或者雷雨时拥sai天空的积雨云,光线很难透she1过来,云ti看起来就很黑,稍微薄一点的层状云和波状云,看起来就是灰se的;而很薄的云,光线容易透过,特别是由冰晶组成的薄云,云丝在yang光下显得特别明亮,带有丝状光泽,有时云层薄得几乎看不chu来。当日chu和日落的时候,由于太yang光线是斜she1过来的,穿过很厚的大气层、空气中的分子、水汽和杂质,使得光线的短波bu分大量散she1,而红、橙se的长波bu分,却散she1得不多,因而照she1到大气下层时,长波光(其中特别是红光)占着绝对的多数,这时不仅日chu、日落方向的天空是红se的,就连被它照亮的云层底bu和边缘也变成红se了。

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