下过雨以后,地上积了水,经过几天,这些积水就会干掉,这是我们常见的事。水是怎样干掉的呢?原来空气是比较干燥的,水在干燥的空气里慢慢地变成了水汽,散发到空中去,这就叫作蒸发。我们日常看见的蒸发现象很多,像洗过的衣服把它晾干,食物几天没吃也会变干,这都是因为水分变成了水汽蒸发掉了。 After it rained, water accumulated on the ground. After a few days, the accumulated water will be destroyed. This is a common thing for us. How did the water get rid of? The original air was relatively dry. The water slowly turned into water vapor in the dry air and was emitted into the air. This was called evaporation. We see a lot of evaporation every day, like clothes washed to dry it, food will dry out after a few days of eating, this is because the water becomes water vapor evaporated.