Because of the Archimedes' principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/L). Only certain lighter than air gases are suitable as lifting gases.
Read more about Lifting Gas: Hydrogen Versus Helium, High-altitude Ballooning, Submerged Balloons, Balloons On Other Celestial Bodies, See Also
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