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comment by ButterflyEffect
ButterflyEffect  ·  1725 days ago  ·  link  ·    ·  parent  ·  post: Hubski Science Quiz #1 - updated with answer!

The lower one. CO2 will sink, extinguishing the lower candle as it's oxygen supply runs low. O2 will rise allowing the taller one to keep burning.

Unless something went horribly wrong and you needed to use that fire extinguisher (I hope not).

mike  ·  1725 days ago  ·  link  ·  

The fire extinguisher in the picture was a happy accident!