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為什么下雪時天氣暖

放大字體  縮小字體 發(fā)布日期:2008-03-07
核心提示:又到冬天了,紛飛的白雪給大地披上銀裝。人們賞雪、玩雪不亦樂乎。但你沒有注意過下雪的天氣其實都不是太冷呢?下面就來為您解答這個疑惑。 Snowing does not cause the warmth, the relative warmth causes the snow. During very cold weather the capacity of the a


    又到冬天了,紛飛的白雪給大地披上銀裝。人們賞雪、玩雪不亦樂乎。但你沒有注意過下雪的天氣其實都不是太冷呢?下面就來為您解答這個疑惑。

    Snowing does not cause the warmth, the relative warmth causes the snow.

    During very cold weather the capacity of the air to contain moisture is greatly reduced. What water vapor remains is deposited as frost. At the same time, evaporation is reduced and therefore air humidity remains low. In these conditions snow cannot form.

    Warmer air can hold more moisture before the saturation point is reached and the water vapor begins to condense out. So when warmer air moves into cooler areas, not only do we feel the increase in temperature, but the excess vapor precipitates as snow. 

 

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關(guān)鍵詞: 下雪 天氣暖
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