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HOT AIR BALLOON IS FILLED WITH AIR HEATED BY BURNER<br />
Hot air rises in cooler air. This is the principle which allows hot air balloons to take flight.

Fphoto-27629008A-2RM.jpg

HOT AIR BALLOON IS FILLED WITH AIR HEATED BY BURNER
Hot air rises in cooler air. This is the principle which allows hot air balloons to take flight.

Copyright:© 1990 Richard Megna - Fundamental Photographs

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