Quote:
Originally Posted by shazzbat
"AIUI the ethylene gas
which ripens them is heavier than air and this will concentrate the gas
round the toms and help them to ripen.
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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.