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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.
Helium is lighter than air. Youâll usually hear the phrase, âhelium is lighter than air,â but thatâs not entirely accurate. Itâs actually more appropriate to say that helium is less dense than air. Thatâs because helium molecules are not packed together as densely as air molecules are. It is this simple reason that helium balloons float in the air. Itâs also the key to understanding why helium balloons deflate faster in cold air. Answer: They donât. Yes, itâs true that your helium balloon may have shriveled up and is now resting on the cold floor instead of floating in the air.