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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.
One (1) gallon of liquid ammonia weighs approximately 5 lbs; however, the weight varies with temperature. When liquid ammonia reaches a temperature between its melting and critical points, it exerts a vapor pressure that increases with temperature.