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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.
Is nitrogen heavier than air? A: Nitrogen is the major constituent of Earth's atmosphere, so it is, in a way, exactly as heavy as air. Though nitrogen makes up the bulk of the atmosphere by volume, almost 21 percent of the air is composed of molecular oxygen. To determine nitrogen's weight relative to air, it is important to determine whether the nitrogen in the atmosphere is lighter or heavier than the oxygen.