Quick answer
Subtract the water-vapor pressure from the total pressure before applying Dalton’s law. Enter pressure in consistent units and keep the vapor-pressure temperature with the result.
Formula and steps
Pdry,total = Ptotal − PH2O; Pi,dry = yi × Pdry,total
Normalize the inputs first, keep working precision through intermediate steps, and round only the displayed result. Use the Partial Pressure when the next step requires a different chemistry model.
Assumptions and limits
This is a transparent planning model with a defined scope. It does not validate an instrument, sample identity, chemical safety, purity, or a regulated procedure.
Frequently asked questions
What does this wet gas partial pressure assume?
The assumptions shown above are part of the result. If your system falls outside them, select a more complete method rather than forcing the number.
How should I report the answer?
Keep the units, input basis, significant figures, and model limitations with the result.