THE 5-SECOND TRICK FOR POTASSIUM CYANIDE KSP

The Vapor Density comparisons are only valid when the fuel escaping is at the same temperature as being the bordering air alone. In case the chemical is escaping from a container where it was pressurized or refrigerated, it may well 1st escape and behave like a large gas and sink during the air (even though it has a Vapor Density value below one).