What is the approximate volume of oxygen present in one liter of air?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Biology Mcqsbiology-mcqs
Published
23 May 2018
Last updated
28 May 2026

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Explanation

Air contains about 21% oxygen by volume, which translates to roughly 200 milliliters of oxygen in every liter of air.

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