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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.
Ammonium is also used in the production of fertilizers and explosives. It is also used in the rocket propellant and also in water filters and as food preservatives. Summary. 1  Ammonia is a weak base and is un-ionized. 2  On the other hand, Ammonium is ionised.3  Ammonia gives out a strong smell whereas Ammonium does not smell at all.4  Ammonia is toxic or harmful to aquatic organisms.mmonia is a weak base and is un-ionized. On the other hand, Ammonium is ionised. One of the noticeable differences between the two is that Ammonia gives out a strong smell whereas Ammonium does not smell at all.