雾,是自然界当中再平常不过的天气现象,其形成的原因很复杂,但原则上脱离不开以下几个条件,即:冷却、加湿、递增的水汽含量。我们知道:空气中所容纳的水汽达到饱和后,多余的水蒸气在低温状态下会凝结出来、成为微小的水滴或者是细小的冰晶。当大气中的这种悬浮水汽的凝结达到一定密度,水平能见度低于1000米时,气象学上称这种低空的物理现象为雾。 Fog is another normal weather phenomenon in nature. The reason for its formation is complicated, but in principle it can not be separated from the following conditions: cooling, humidifying and increasing water vapor content. We know that when the water vapor in the air is saturated, the excess water vapor condenses out at low temperatures, becoming tiny drops of water or tiny ice crystals. When the atmosphere of this suspended vapor condensation reaches a certain density, the level of visibility is lower than 1000 meters, the meteorology called the low-altitude physical phenomenon of fog.