热气球是利用加热气球内部的空气致使气体密度变小，重量变轻，产生净浮力飞行。热气球主要通过自带的机载加热器来调整囊中空气的温度，从而达到控制气球升降的目的。热气球的基本原理是热胀冷缩。当空气受热膨胀后，比重会变轻而向上升起。

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