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Fav十万个为什么
为什么热气球能飞上天？
热气球能飞上天，主要基于空气密度差和浮力原理。以下是具体原因：
1、热空气密度低：热气球内部充满加热后的空气。热空气的分子运动速度更快，分子间距更大，导致其密度低于外部冷空气。根据阿基米德原理，密度较低的物体会受到浮力的作用。
2、浮力作用：由于热气球内部的热空气密度低于外部冷空气，热气球受到的浮力大于其自身重力。这种浮力差使热气球能够克服重力，向上飞行。
3、控制升降：通过调节热气球内部的空气温度，可以控制热气球的升降。加热空气使其膨胀，密度降低，热气球上升；反之，降低空气温度使其收缩，密度增加，热气球下降。
总结：热气球能飞上天，主要是因为热空气密度低于冷空气，产生浮力差。通过控制内部空气温度，可以调节热气球的升降。这些原理共同作用，使热气球能够实现飞行。
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