Silly me!
 
Did I say carbon weighed 14?  I probably did.  I should have said 12
 - 12.010 to be a little more precise - most carbon has weight of
12.  Only a few fairly uncommon isotopes are heavier.
 
I guess that's what comes of getting up at 3 AM and answering mail.
 
Anyhow, the effect is the same; CO2 is pretty heavy.
 
Though I'd better correct that before we get in an arguement about
chemistry :-)
Regards
 
Allen
 
W. Allen Dick, Beekeeper                                         VE6CFK
RR#1, Swalwell, Alberta  Canada T0M 1Y0  Internet:[log in to unmask]
Honey. Bees, Art, & Futures <http://www.cuug.ab.ca:8001/~dicka>