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A lifting gas, or lighter-than-air gas, is a gas that has a density lower than normal atmospheric gases and rises above them as a result, making it useful in lifting lighter-than-air aircraft. Only certain lighter-than-air gases are suitable as lifting gases. Dry air has a density of about 1.29 grams per liter (g/L) at standard conditions for temperature and pressure (STP) and an average molecular mass of 28.97 g/mol,

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