#lighter than air

• Female aeronaut — A woman specialized in aerial navigation, who pilots or belongs to the flight crew of an aerostat, balloon, or airship. The term highlights the female contribution to the development of atmospheric navigation, including both the daring women from the pioneering era of aerostation and modern female specialists in lighter-than-air flight.
• Aerostat — A flying apparatus lighter than air, whose sustenance and ascent in the atmosphere rely on Archimedean force (static lift), being filled with a gas less dense than the surrounding air (such as helium, hydrogen) or with hot air. This structural category encompasses free balloons, captive balloons, and mechanically propelled airships.
• Aerostatic — Relating to aerostatics or to the equilibrium of gases and bodies immersed in them; concerning flying apparatus lighter than air, whose atmospheric sustainability relies on static Archimedean force. The term describes the mechanical properties, internal pressures, gas-tight envelopes, or hydrostatic principles applied to gaseous media.
• Aerostation — The science, technology, or practical activity dealing with the design, construction, piloting, and operation of aircraft lighter than air (aerostats, balloons, airships). It represents the first historical stage of human aerial navigation, theoretically grounded in the laws of static and hydrostatic lift applied to large volumes of light gases or hot air.