Snow and rain,the air is the cooling water from the condensation,condensation is only when the degree of cold,and thus have rain,snow difference.When the air temperature is very low level,the water vapor condensation in the air,is not it condenses into water droplets,but by the water vapor condenses into direct light snow film.By the gas passing through the liquid directly into a solid condensation of this change,in meteorology,called "sublimation." As a result,that snow is a special way of the formation of ice.When the clouds at the same time there is a cooling of the ice crystals and water droplets (clouds stability in the air,the temperature at -20 degrees Celsius or lower,the cloud has been able to maintain the water droplets,known as the cooling water droplet),Snowflake easy to generate.Cooling off the ice than water droplets evaporate easily.When the ice crystals on the evaporation of water vapor will not reach saturation,and the cooling-off drops at this point in time did not stop the evaporation,evaporation of water vapor on the surface of ice crystals in China increased by condensation,and gradually increase the volume,has become a branch of osteoporosis The small hexagonal Binghua,and this is snow.
The snow is very beautiful shape,it's very neat pattern,the structure of the complex and diverse forms.Has found there are more than 4000 kinds of different patterns.Some of them like a blooming peony,plum blossom,some as thin,and some,like the separation of Zhicha antlers,and some,like the glass on Ice frozen.If you put them together,we can form a beautiful pattern.
雪和雨一样,都是空气里的水汽冷却凝结而成的,只是凝结时天气冷的程度不同,因而有了雨、雪的区别.当天空上层的温度很低、空气中的水汽凝结时,它就不是凝结成水滴,而是由水汽直接凝结成小雪片.由气体不经过液体而直接凝结成固体的这种转变,在气象学上叫做“升华”.因此,可以认为雪花是经过一种特殊方式形成的冰.当云层中同时存在着冰晶和过冷的水滴（云层气流稳定,温度在—20摄氏度或更低时,云中尚能保持的水滴,叫做过冷的水滴）时,容易生成雪花.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.
雪的形状十分美丽,它的花纹非常整齐,结构复杂,形状多样.已经发现的有4000多种不同的花纹.它们有的像盛开的牡丹,有的像瘦削的梅花,有的像分出枝杈的鹿角,有的像玻璃上冻结的冰花.如果把它们摆在一起,就能构成一幅美丽的图案.
以上,希望对你有所帮助.
