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$\begingroup$ Maybe for medicine they use pure oxygen but not higher than a critical absolute pressure? $\endgroup$
– user43021
Commented Jun 7, 2018 at 0:05
$\begingroup$ @santimirandarp High absolute pressure is cumbersome, because you need a slow decompression afterwards. Hence the use of pure oxygen at only moderately increased abs. pressure. $\endgroup$
– Karl
Commented Jun 7, 2018 at 5:50
$\begingroup$ Yes, I just was saying because it possibly answer the last part of OP question... $\endgroup$
– user43021
Commented Jun 7, 2018 at 14:55

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