Roy wrote:
There seems to be differences of opinions on the properties of carbon
monoxide gas. One source says its heavier than air another says its
lighter, so.......is it heavier or lighter than air?

To be honest I rather trust the info from this forum than various
websites and media types.


Air is a mixture of about 80% nitrogen (molecular weight approx. 28)
and 20% oxygen (molecular weight approx. 32). Carbon monoxide has a
molecular weight of approximately 28. So it's very slightly lighter
than air.

That only matters for a short while, though. Because it won't be too
long before the gases mix thoroughly, regardless of their densities.
How long is hard to say. You can calculate the time for perfectly
still gases, but it's drastically reduced when the gases are stirred up
even a little bit, as they are by people moving around, changes in
barometric pressure, etc.

John Martin