冬天,玻璃窗上的冰花是室內空气中的水汽“凝华”成的。水汽直接变为冰的过程叫做“凝华”。在一定的溫度下,大气中所能容納的最大水汽量是一定的。如果大气中的水汽达到了在这个溫度下所能容納的最大量,我們便說大气中的水汽是“飽和”了。如果空气中的水分超过了这个最大量,便說是“过飽和”。溫度愈低, In winter, the ice on the glass window is “condensed” into the water vapor in the indoor air. The process of direct conversion of water vapor to ice is called “sublimation.” At a certain temperature, the maximum amount of water vapor that can be contained in the atmosphere is constant. If the water vapor in the atmosphere reaches the maximum amount that can be accommodated at this temperature, we say that the water vapor in the atmosphere is “saturated.” If the moisture in the air exceeds this maximum amount, it is said to be “supersaturated.” The lower the temperature,