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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.
Summary. 1  Ammonia is known as a weak base, while bleach is said to be a strong oxidizing agent. 2  Ammonia consists of one nitrogen atom and three hydrogen atoms. 3  In disinfectant quality, bleach is considered to be a stronger disinfectant than ammonia.  Ammonia is better on hard surfaces than bleach.