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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 gas is less dense than air. Nitrogen is lighter than air because it has a lower density than air. The density of #N_2# gas at STP is #1.2056 kg/m^3#, and the density of air at STP is #1.293 kg/m^3#. So, there is less mass of #N_2# per cubic meter, and a greater mass of air per cubic meter.