Lighter-than-air Craft
Lighter-than-air craft are aircraft that rely on their buoyancy to stay aloft. They are divided into two main categories: balloons and airships. Balloons are unpowered and rely on the wind to move, while airships are powered and can be controlled in flight. The buoyancy of these craft is achieved through the use of gases that are lighter than air, such as helium or hydrogen. Lighter-than-air craft have been used for a variety of purposes, including transportation, military operations, and scientific research.
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