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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.
There some truth in these posts, youll be fine welding with it, but yes it does displace air. Argon is a heavier than air gas, which means when it gets into your lungs, it sits at the bottom of your lungs and isnt exhaled. The more argon you breath in, the more your lungs fill with it, until there isnt any room left in your lungs for the air that they need.