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Why is oxygen collected by downward displacement of water? - Quora
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Why is the amount of nitrogen in the atmosphere higher than other gases compared? - Quora
Which of the following gases is lighter than air?A. OxygenB. Hydrogen chlorideC. AmmoniaD. Chlorine
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Why is humid air lighter than dry air?
Thanks google. "Is carbon monoxide heavier than air?" It's not, spreads evenly throughout a room. : r/mildlyinfuriating
