Lifting gas
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A lifting gas, or lighter-than-air gas, is a gas that has a density lower than normal atmospheric gases and rises above them as a result, making it useful in lifting lighter-than-air aircraft. Only ce
Francesco Lana de Terzi's vacuum airship (1670)
MAXIS: a balloon that has reached a height of 36 km
Airship
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An airship, dirigible balloon or dirigible is a type of aerostat aircraft that can navigate through the air flying under its own power. Aerostats use buoyancy from a lifting gas that is less dense tha
Lifting gas
…the diver's ship on the surface. Submarines use ballast tanks and trim tanks with air to regulate their buoyancy, essentially making them underwater "airships". Bathyscaphes are a type of deep-sea submersible that use gasoline as the "lifting gas". A balloon can only have buoyancy if there is a medium that…
A modern airship, Zeppelin NT D-LZZF in 2010
Dirigible airships compared with related aerostats, from the Brockhaus and Efron Encyclopedic Dictionary, 1890–1907
U.S. Navy airships and balloons, 1931: in the background, ZR-3, in front of it, (l to r) J-3 or 4, K-1, ZMC-2, in front of them, "Caquot" observation balloon, and in foreground free balloons used for training
The air-filled red balloon acts as a simple ballonet inside the outer balloon, which is filled with lifting gas.