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Aerostat
An aerostat (From Greek ἀήρ ''aer'' (air) + στατός ''statos'' (standing) through French) is a lighter than air craft (the average density of the craft is lower than the density of atmospheric air) that gains its lift through the use of a buoyant gas. Aerostats include unpowered balloons and powered airships. A balloon may be free-flying or tethered. An aerostat's main component is one or more gasbags, a lightweight skin containing a lifting gas to provide buoyancy, to which other components such as a gondola containing equipment or people are attached. Especially with airships, the gasbags are often protected by an outer envelope. One of the most recent deployments of an aerostat was seen at the opening ceremony of the nineteenth 2010 Commonwealth Games, held in Delhi, India. The aerostat used in the ceremony was the largest in the world.
Aerostats are so named because they use aerostatic lift which is a buoyant force that does not require movement through the surrounding air mass. This contrasts with the heavy aerodynes that primarily use aerodynamic lift which requires the movement of a wing surface through the surrounding air mass. The term has also been used in a narrower sense, to refer to the statically tethered balloon in contrast to the free-flying airship. This article uses the term in its broader sense.
==Terminology==
In conventional usage, the term aerostat refers to any aircraft that remains aloft primarily using aerostatic buoyancy.〔Green, W.; ''The observer's world aircraft directory'', Warne (1961)〕〔Wragg, D.; ''Historical dictionary of aviation'', History Press (2008).〕
The US Government Accountability Office has used the term "aerostat" in a different sense, to distinguish the statically tethered balloon from the free-flying airship.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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