what happen inside a jar not coverd, what happen inside a jar covered with lid, what is the meaning of burning, what is the components of air, which gas in the air helps in burning, W.H to flam of candle if it but in jar of co2, nitrogen help in burning (t-f), co2 dont help in burning (t-f), if there a gap in the bottom of the jar and covered on the top W.H to the flam, to keep the flam glowing the air must be ................, the percentage of N2, the percentage of O2, the percentage of Co2

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