十万个为什么·科学阅读30篇（6）
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Why Does Fog Form Near Rivers in the Morning?
为什么清晨河面附近容易起雾？
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Fog forms when cool air meets warm, moist river water.当冷空气遇到温暖潮湿的河水时，就会形成雾。
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Water evaporates from the river surface all night long.整夜河水表面都在蒸发水汽。
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When cold air moves over the warm, wet air, it cools down fast.当冷空气流经温暖潮湿的空气时，会迅速降温。
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Tiny water droplets then gather and hang low in the air.微小的水滴随之聚集，并悬浮在近地面的空气中。
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Rivers stay warmer than land overnight, so fog appears there first.河流夜间比陆地保温更好，因此雾最先出现在河面。
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Sunlight warms the air later, and the fog slowly disappears.阳光随后加热空气，雾便慢慢消散。
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This kind of fog is called radiation fog and is very common.这种雾被称为辐射雾，十分常见。
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It reminds us that air temperature and moisture work closely together.它提醒我们，气温与湿度密切相关。