Thanks for insights, Jean Marius. As a matter of fact You are 100% right. There are definitions, rules and conventions. To live on earth and deal with other human beings we also need to accept conventions: today the 99% easily becomes 100% at people's eyes... ...whereas the lack of free oxygen is considered anoxic and the lack of both free+bound oxygen is called anaerobic. Tolerances and scale, that's what I mean. We are into industrial treatment, we're not into analytical lab theory. IMHO 0,0000000% as well as 100,00000% are set points, working hypo, not Always achievable in the real industrial world. Just my thought

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Thanks for insights, Jean Marius. As a matter of fact You are 100% right. There are definitions, rules and conventions.
To live on earth and deal with other human beings we also need to accept conventions: today the 99% easily becomes 100% at people's eyes...
...whereas the lack of free oxygen is considered anoxic and the lack of both free+bound oxygen is called anaerobic. Tolerances and scale, that's what I mean.
We are into industrial treatment, we're not into analytical lab theory. IMHO 0,0000000% as well as 100,00000% are set points, working hypo, not Always achievable in the real industrial world.
Just my thought