Quote:
Originally Posted by echinosum
Actually ethylene (C2H2 molecular mass 28) is close to the same density as nitrogen (N2 mm 28), and less than oxygen (O2 mm32), so it is very slightly lighter than the average density of air. But clearly an enclosed space will discourage the ethylene from diffusing into the room quite as quickly.
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Whoops arithmetical error. C2H2 is mm 26, so lighter than nitrogen. So something like 10% lighter than air.