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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.
Yes is the correct answer. Refrigerant, and in this case I am speaking specifically about R-134a, but itâs typical of refrigerant gases, is heavier than air. Always check with the refrigerant manufacturer, but the chemical composition of R-134a is all the same regardless of the name on the canister.