But in quite is thin and the quitestable water in the clouds, the cloud drop not enough congeals andcombines the growth opportunity, only can cause, the cloudy daycloudy, the congress does not rain.

• 过冷却的水滴比冰晶容易蒸发。当冰晶上的水汽达到饱和不再蒸发时，而过冷却的水滴在这时候并没有停止蒸发，蒸发的水蒸气就在冰晶的表面上升华凝结，体积逐渐增大，变成了疏松枝状的六角形的小冰花，这就是雪。