hot air balloons
Heated-gas aircraft
Hot air balloons are aircraft that rise because heated air inside a large fabric envelope is lighter than the cooler air outside.
The balloon carries passengers in a basket suspended below, with a burner directing flame upward to maintain lift.
They drift with the wind and cannot be steered precisely: We watched hot air balloons float over the valley at sunrise.
- AlbuquerqueNew Mexico's largest city
- Montgolfier brothersInvented hot-air ballooning
- buoyancyFluid's upward resistance
- envelopeFolded paper enclosure
- ballooningSwelling or aerial drifting
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hot air balloonsdirigibles
Steerable lighter-than-air vessels
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