Partial Pressure of a Dry Gas Calculator

Calculates the partial pressure of a dry gas from barometric pressure and gas fraction.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
Partial pressure
—
mmHg
Gas fraction
—
decimal
Context
—
dry gas
Normal/reference: Dry ambient oxygen at sea level is approximately 159–160 mmHg when PB is 760 mmHg and oxygen fraction is about 20.95–21%.

Clinical Significance

The partial pressure of a dry gas from barometric pressure and gas fraction.

This calculator expands that idea by identifying the relevant measured values, substituting the selected inputs, and carrying the arithmetic through in the solving steps.

Applies Dalton’s law to dry gas mixtures and altitude/hyperbaric comparisons.

For humidified inspired gas, subtract water vapor pressure before multiplying by gas fraction.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.