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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.
Under normal temperature and air pressure, anhydrous ammonia is a colorless gas. However, anhydrous ammonia is used and transported under pressure as a liquid. All equipment used for applying or transferring liquid anhydrous ammonia must be designed for use under high pressure to avoid ruptures or breaks.