Quote Originally Posted by kermit View Post
I was actually told that Co2 is heavier than air. Thats why is doesn't last. I hate using them as well but its a necessary evil. Flats suck more.
Air is a combination of about 80% nitrogen and 20% oxygen. Carbon dioxide is actually more dense than air.

If you mix vinegar and baking soda together in a container with a lighted candle, the candle will go out since the carbon dioxide produced pushes the air (lighter) up and the carbon dioxide (heavier) stays in the bottom and extinguishes the flame.