DAGS kinetic theory of gases; Google says there are 319000 hits.

Steve

"Dave W" wrote in message
...
dadioh,
It is true that exhaled air has more carbon dioxide than air does. It
is true that carbon dioxide is heavier than the other constituents of air.
BUT, if you expect the carbon dioxide to "settle out" you will have to
wait a long time. Brownian motion and other factors keep the gases well
mixed.