Subject: Amount of Oxygen in a Closed Container with Burning Candle

If you put a jar over one burning candle and another same type jar over two 
burning candles, would you trap the same amount of oxygen in both jars?  The 
question came up when my students were doing a lab (mentioned several times in 
the archive) where they put a lighted candle in a pan of water, cover it with a 
jar, and observe what happens.  They then modified the experiment by covering 
two lighted candles with the same type jar.  What they observed was that more 
water went into the jar with two candles than one candle.  We then talked about 
the difference in pressure inside and outside the jar.  One student asked why 
there would be a lower pressure inside the jar with two candles as opposed to 
the jar with one candle if they both started out with the same amount of 
oxygen.  I thought it had more to do with heat than the amount of oxygen...but 
then, do we have the same amount of oxygen/gases in both containers?

Re: Amount of Oxygen in a Closed Container with Burning Candle