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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.
O2, the oxygen molecule, is much heavier than N, a nitrogen atom. Therefore, if the oxygen level was higher, the atmosphere was heavier. Imagine the difference between flying in modern air, and flying under water, which any scuba diver can do. Now move 10% down the scale from air toward water.2, the oxygen molecule, is much heavier than N, a nitrogen atom. Therefore, if the oxygen level was higher, the atmosphere was heavier. Imagine the difference between flying in modern air, and flying under water, which any scuba diver can do. Now move 10% down the scale from air toward water.