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To answer the question, pure ammonia has a density of ~0.7-0.9 g/L, depending on temperature. The density of air is ~1.2 g/L, again depending on temperature and pressure. So, yes, ammonia gas is lighter than air in terms of density. 3 people found this useful.
Nitrogen doesnt expand with heat. Air does. They are mixable, but it's best to just stick with one or the other. The air in the atmosphere is approx 78% â¦ nitrogen anyway.