Lifting gas
From The Art and Popular Culture Encyclopedia
(Redirected from Lighter-than-air)
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Lighter than air refers to materials (usually gases) that are buoyant in air because they have densities lower than that of air. Dry air has a density of about 1.29 g/L at standard conditions for temperature and pressure (STP), and an average molecular mass of 28.97 g/mol.
Some of these gases are used as lifting gases in lighter-than-air aircraft, which include free balloons, moored balloons, and airships, to make the whole craft, on average, lighter than air. (Heavier-than-air aircraft include airplanes, gliders and helicopters).
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