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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.
1 Gas/Vapor Density. The importance of gas/vapor density is whether the gas/vapor is lighter or denser than air. If. lighter than air, they will rise; denser than air and they will fall. Hydrogen, acetylene, ammonia, methane, ethylene, and carbon monoxide are the most common flammable gases that are. lighter than air.