空氣中的水蒸氣在遇熱上升後，在對流層內，隨著高度的增加，氣壓降低，氣體進行絕熱膨脹，氣溫下降，水的飽和蒸氣壓亦隨之降低，過多的水氣附著在灰塵、鹽粒等凝結核上，形成冰晶又或是小水珠，然後形成了雲。
當小水滴不斷碰撞增大、增重以至於無法漂浮在空中時就會掉落下來，形成降水。
ns216.73.216.148da2
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來自雲國的我們，不曾留戀
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來自雲國的我們，不曾留戀
Author:
杉香
杉香
ISSUE #1
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