... 7000' elevation is 30.25 today. 30.25 is the measurement in Inches of Mercury. That converted into PSI is about 14.8 PSI which is higher than the standard 14.5/1ATM. So my question is, regardless of elevation, does the partial pressure of O2 rise as the barometric pressure rises? (Thinking of Dalton's law). Or does elevation effect the way the pressure is read to begin with?