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comment by blackfox026
blackfox026  ·  1731 days ago  ·  link  ·    ·  parent  ·  post: Hubski Science Quiz #1 - updated with answer!

I think the taller candle will go out first. The cooler, more dense air will sink to the bottom of the container, and so as the concentration of oxygen becomes less and less the smaller candle will still have more fuel to burn than the taller candle.

mitvit  ·  1730 days ago  ·  link  ·  

I agree with this. CO2 is more dense than oxygen, but hot air rises, and there's not much time for any cooling.