how will you show that Oxygen gas is required for burning
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After some time, when all the oxygen of air inside the gas jar is used up, then the burning candle gets extinguished. This proves that air is necessary for combustion of substance
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first burn some logs of wood after some time cover it with a fat blanket
after some time you will see there is no fire this is because when you cover the fire with the blanket it doesn't allow oxygen to come in
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