The _____ in the air comes down air. Option a water vapour option b oxygen option c nitrogen option d hydrogen
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Answer:
Oxygen in the air comes down as oxygen is only the gas through which we can breath
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Correct option: Oxygen
Oxygen is denser than both air and nitrogen, at all temperatures and pressures, but only slightly. Since they don't separate from each other, we generally don't worry which is lighter or heavier. The difference in the density of nitrogen and oxygen gas comes from their molecular weight, which is small (4 g/mol).
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