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    $\begingroup$ This answer is worthy of a bounty. $\endgroup$ Commented Sep 11, 2019 at 15:16
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    $\begingroup$ Atomic Argon is only slightly heavier than mollecular Oxygen (40g/mol vs 32g/mol) similar to how much heavier Oxygen is to molecular Nitrogen (28g/mol) - it won't stratify. $\endgroup$
    – Dale M
    Commented Sep 13, 2019 at 1:13