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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.
Air is itself a mixture of different gases. If you want to know if it is lighter than a gas or not, you have to compare the respective densities. In that aspect, air is lighter than some gases and heavier than some other.The following image will help-.