TrimixToo
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I didn't mean to imply greater or lesser solubility, since I don't recall it being discussed and didn't look it up, so I plain don't know. I don't think it's hidden in what I wrote, which was mean to describe it. Perhaps I could have done that better (shrug). Your last sentence is precisely on point.Actually, O2 is more soluble in water than N2 or inert gases, you can check the data available. The likely explanation for the CO/ascent phenomena can be hidden in the text you just printed. As PPO decreases during the ascent, so does the concentration of the dissolved O2, and this ruins the bypass mechanism of the O2 transport via O2 solubility.