雨(rain)是從云中降落的水滴,陸地和海洋表面的水蒸發(fā)變成水蒸氣,水蒸氣上升到一定高度后遇冷變成小水滴,這些小水滴組成了云,它們?cè)谠评锘ハ嗯鲎?合并成大水滴,當(dāng)它大到空氣托不住的時(shí)候,就從云中落了下來,形成了雨.
另附英文：
Rain is liquid precipitation,as opposed to other kinds of precipitation such as snow,hail and sleet.Rain requires the presence of a thick layer of the atmosphere to have temperatures above the melting point of water near and above the Earth's surface.On Earth,it is the condensation of atmospheric water vapor into drops of water heavy enough to fall,often making it to the surface.Two processes,possibly acting together,can lead to air becoming saturated leading to rainfall:cooling the air or adding water vapour to the air.Virga is precipitation that begins falling to the earth but evaporates before reaching the surface; it is one of the ways air can become saturated.Precipitation forms via collision with other rain drops or ice crystals within a cloud.Rain drops range in size from oblate,pancake-like shapes for larger drops,to small spheres for smaller drops.