"echinosum" wrote in message
...

shazzbat;903743 Wrote:
"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.
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.


I sit corrected.

Steve