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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.
Therefore, humid air is lighter than dry air. and the water vapour pressure is p, the partial pressure of the dry air component is P - p . weight ratio of the two components, water vapour and dry air is: so, approximately: The heat content, usually called the enthalpy, of air rises with increasing water content.