PiO2 at sea level when FiO2 = 1.0 is approximately:

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PiO2 at sea level when FiO2 = 1.0 is approximately:

At sea level, the inspired oxygen partial pressure depends on the portion of atmospheric pressure not occupied by water vapor, because air is humidified to body temperature. The formula is PiO2 = FiO2 × (Patm − PH2O). With FiO2 = 1.0, Patm about 760 mmHg and PH2O ≈ 47 mmHg at 37°C, so PiO2 ≈ 1.0 × (760 − 47) = 713 mmHg. So the value around 713 mmHg is the correct one.

At sea level, the inspired oxygen partial pressure depends on the portion of atmospheric pressure not occupied by water vapor, because air is humidified to body temperature. The formula is PiO2 = FiO2 × (Patm − PH2O). With FiO2 = 1.0, Patm about 760 mmHg and PH2O ≈ 47 mmHg at 37°C, so PiO2 ≈ 1.0 × (760 − 47) = 713 mmHg. So the value around 713 mmHg is the correct one.

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