at STP, average atomic mass 20.17 g/mol) and could slowly lift a balloon. Like helium, it is non-flammable. However, it is rare on Earth and expensive, and is among the heavier lifting gases.

Nitrogen

Pure nitrogen has the advantage that it is inert and abundantly available, because it is the major component of air. However, because nitrogen (as N₂) is only 3% lighter than air, it is not a good choice for a

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