The Vapor Density comparisons are only valid when the gas escaping is at the identical temperature as being the surrounding air by itself. Should the chemical is escaping from a container where it had been pressurized or refrigerated, it could to start with escape and behave being a weighty gas https://potassiumcyanide78654.actoblog.com/30216585/potassium-cyanide-gas-things-to-know-before-you-buy