白云（7）

White puffy clouds

Why is there a difference between white and dark clouds?

白云和乌云所来何为

A cloud is a condensation of water vapour in the atmosphere.

云是由大气中的水蒸气凝结成的。

Surface water evaporates in summer heat

夏日高温，地表水蒸发

In the high air, encountered cold air condensation

高空之中，遇冷凝结

Drift with the wind, this is the white clouds

随风漂荡着，这就是白云

If the condensation is excessive,

如果凝结过度，

Water vapor supersaturation

水汽过饱和

Then became a dark cloud

遂成乌云

Due to wind and other conditions

由于风力等条件作用

White and dark clouds can transform each other

白云和黑云亦可相互转变