The word aerostat was originally French and's derived from the Greek aer (air) + statos (standing). An aerostat's a lighter than air object that can stay stationary in the air. Aerostats include free balloons, airships, moored balloons and tethered Helikites. Such a vehicle consists of a lightweight skin filled with a lifting gas to create buoyancy. Technically, aerostats are capable of providing "aerostatic" lift in that the force upwards arises without movement through the surrounding air ma… (More on Aerostat)