When a hot air balloon is waiting to get off the ground, the pilot will blast the air inside the balloon with hot flame. This pushes air out of the balloon, and with less air it is less dense so can rise into the sky.
Explain how the flame pushes the air out.
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Hot air is less dense than cold air and so hot air will be buoyant when surrounded by cold air. Hot air balloons can only fly when the air inside the balloon is much hotter than the air outside it. When the air outside is very cold, then the air inside the balloon doesn't have to be as hot to lift it up!
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