High altitude, and low octane

[Virtual Bob]

> > The partial pressure of O2 decreases with altitude.
> > At sea level, O2 accounts for about 21% of the total pressure
> > while at 18,000 feet O2 only provides about 12 or 13% of the total
> > atmospheric pressure.

> Isn't that because O2 is heavier than N2?  So it runs to the bottom...

Yeah. Same thing could be said of dust particulates, but the atomosphere
ain't standing still so settling couldn't occur.

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