[nj_bartel]

one of which is a concentrated ammonia solution, waft, don't sniff like you're trying to breathe in the aroma of a fine wine.

8 hours later and the smell is just leaving my nostrils.

[Arkcon]

I read, as a child, the waft mode of telling what a chemical smells like.  The kids laughed at me, in my junior high chemistry days, so I stopped, and just started sniffing.  That is a bad idea, in my college basic chemistry days, I was kinda hit or miss -- if I knew a gas was coming, I wafted, but once I was doing some sort of reaction with a nitrogen compound, and I got a brown gas, and I sniffed instead of wafted and ... ow, NO2, smells like ... burning.