Alate_One
Well-known member
Not as a vapor they aren't. Try again. I take it you had no idea that CFC 12 sinks to the ground. Which is why if you use a chemical sniffer to look for an A/C leak, you are to test the bottom.
PCBs are far heavier than air yet they're found in the arctic and antarctic where no one has every used PCBs. Do you know why? Global atmospheric transport. Lots of things that are heavier than air are transported around the world by the wind.