In FromTheRafters writes:

[snip]

CO is heavier than 'air'. Smoke is generally in hot air and rises.--
follow their instructions for placement.

Carbon Monoxide has an atomic, well molecular,
weight of Carbon [12] + Oxygeb [16] == 28

Air is a mix of lots of stuff, but if we
just look at nitrogen, which is 78 or
so percent of it, N2 = [14 times 2] = 28

plus, of course, these gases don't remain as
discrete entities but mix in with each other.

So CO is going to be pretty much diffused
throught the air.


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