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乌云是怎么形成的
更新时间: 2019-04-29 00:00:00  

乌云是由雾滴凝结而成。夏日地表水在烈日下迅速蒸发,使空气湿度越来越大;高空的温度低于地表温度,水蒸气在高空到达饱和状态和过饱和状态;高空中会有一些灰尘,成为凝聚中心,使饱和蒸汽和过饱和蒸汽凝成细小的雾滴;雾滴足够密集时就成为白云;雾滴越来越大,白云就变成为乌云。乌云是指白云中的饱和蒸汽和过饱和蒸汽凝成的雾滴越来越大之后改变了颜色的云,是一种自然现象。

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