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为什么热空气比冷空气轻

更新时间: 2020-07-03 00:00:00     

根据热胀冷缩原理,相同质量下热空气比冷空气体积大,所以相同体积的热空气比冷空气轻。

热胀冷缩原理通常是指外压强不变的情况下,大多数物质在温度升高时,其体积增大;在温度降低时,其体积缩小的现象。物体受热时会膨胀,遇冷时会收缩。这是由于物体内的粒子运动会随温度改变,当温度上升时,粒子的振动幅度加大,令物体膨胀;但当温度下降时,粒子的振动幅度便会减少,使物体收缩。

关键词: 为什么 空气 冷空气

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