Explanation:
passing hydrogen through the anode of a fuel cell and oxygen through the cathode.
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<span>Fe3P
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For a candle to burn, it requires a spark, which provides the activation energy for the oxidation reaction of the hydrocarbon making the candle.
It also requires oxygen to facilitate the oxidation of the hydrocarbon.
Therefore the two main requirements of combustion of a candle are oxygen and a spark (or an initial flame)
A rock is definitely more dense. If you were to put a cloud in water it would float/stay above it and a rock would sink to the bottom
