Aug 16, 2010: Russia Burns

[spudcon]

Originally Posted by Bullitt

Fire sucks in fresh air from near the ground, then the heat blasts unburnt fuels and byproduct gases way up into the sky forming those giant plumes of smoke. The CO2 never gets a chance to displace the oxygen feeding the fire because it is carried up so quickly, and is actually released from the fuel source above where combustion is actually occurring.

I got thinking about CO2 being heavier than air, but I guess you explained that too.