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An 'aerostat' is a lighter than air craft including free balloons, airships, and moored balloons. Such a vehicle is lifted by buoyancy, containing a gas less dense than air within an 'envelope'.
The term "aerostat" comes from the fact that buoyancy
is technically said to provide "aerostatic" lift in that the force upwards arises
without movement through the surrounding air mass. This contrasts with aerodynamic
lift which requires the movement of at least some part of the aircraft through the surrounding air mass.
In technical usage, the term 'aerostat' refers only to moored balloons. However, this article uses the term in its broader sense.
Tethered aerostats are in use as radar platforms (''e.g.,'' EL/M-2083 and the Tethered Aerostat Radar System).

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See also

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Types of aerostats:

See also

★ Aerostatics

★ Airship

★ Balloon (aircraft)

★ Buoyancy

★ Lighter than air

★ Moored balloon