the main lighter gas such as helium and hydrogen is found in
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Hydrogen and helium
Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference only results in hydrogen having 8% more buoyancy thanhelium.
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HYDROGEN being the lightest existing gas (7% the density of air), seems to be the most appropriate gas for lifting. It can be easily produced in large quantities,
HELIUM is the second lightest gas. For that reason, it is an attractive gas for lifting as well.
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