A vacuum airship, also known as a vacuum balloon, is a hypothetical airship that is evacuated rather than filled with a lighter-than-air gas such as hydrogen or helium. This would be the ultimate expression of lifting power per volume displaced.
A vacuum airship, also known as a vacuum balloon, is a hypothetical airship that is evacuated rather than filled with a lighter-than-air gas such as hydrogen or helium. This would be the ultimate expression of lifting power per volume displaced.
Source: Wikipedia "Vacuum airship" · CC BY-SA 4.0
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