The word aerostat was initially French and is derived from the greek aer + statos . An aerostat is a lighter than air object that can stay motionless in the air. Aerostats comprise free balloons, airships, moor balloons and tethered Helikites. Such a vehicle is consists of a frivolous skin filled with a lifting gas to create resilience.
Technically, aerostats are capable of as long as "aerostatic" lift in that the force upwards arises without group through the nearby air mass. This contrasts with aerodynamic lift which requires the group of at least some part of the aircraft through the nearby air mass. However, in reality most aerostats obtain lift from together aerodynamic lift and pure gas lift at some time or other.
Aerostats are normally tethered lighter-than-air objects. Types of tethered aerostat include round balloons, blimps and Helikites.
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