A hydrogen gas balloon floats in air because density of hydrogen is less than the density of air. (true or false)
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True
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Density of Gases
If an object containing a gas floats on air, it is less dense than air vs. if it sinks, it is more dense than air. Gas Density examples based upon differences in molecular weight. Density of a gas with a constant number of molecules in a constant volume, varies according to the molecular weight.
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