The Vapor Density comparisons are only valid when the gasoline escaping is at the same temperature because the surrounding air by itself. When the chemical is escaping from a container where it was pressurized or refrigerated, it might 1st escape and behave as being a large gasoline and sink from https://potassium-cyanide25813.robhasawiki.com/10797045/the_potassium_cyanide_hazard_symbol_diaries