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Hot-Air Balloons

Credit: NASA

The nose of an inflatable half-scale model of a NASA F/A-18 points skyward as a host of hot-air balloons ascend at the 2010 International Balloon Fiesta in Albuquerque, New Mexico. Hot-air balloons use heated air to provide buoyancy, because warm air is less dense than cool air.

Categories: Gravity & Air
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