The Vapor Density comparisons are only legitimate when the gas escaping is at the exact same temperature given that the surrounding air by itself. If your chemical is escaping from a container where it was pressurized or refrigerated, it might to start with escape and behave as a weighty fuel https://potassiumcyanidepoisoning36813.blogdon.net/facts-about-where-is-potassium-cyanide-found-naturally-revealed-46228411