why a hot air balloon rises up
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because it have gases molecules inside it and gas have the property of diffusion and highly expansion when the gases is covered by the material of balloon it make it move above as gases are lighter and it make hot air balloon fly and hot air is light .
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Hot air is less dense than cool air; theheated air causes the balloon to risesimply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloonuses a burner to heat up the air inside the balloon.
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