convert ppm CO2 to Pa

I could use some help trying to figure out how to convert ppm of CO2 gas into Pascals (Pa).

Any help would be greatly appreciated.

Thank you.

[JohnS]

Originally Posted by stepht

I could use some help trying to figure out how to convert ppm of CO2 gas into Pascals (Pa).

Any help would be greatly appreciated.

Thank you.

Ppm in a gas is normally expressed on a mole fraction basis, so 385 ppm of CO2 (in the atmosphere) is also 385 µmol/mol.

By Dalton's law of partial pressure, the partial pressure of CO2 to total pressure will be in the same ratio.

"Real" atmospheric pressure varies with altitude above sea level, and day-to-day with the weather; however, "standard" atmospheric pressure is 101.325 kPa.

The partial pressure of CO2 is 385 µmol/mol x 101.325 kPa = 39 Pa. (at least on a day when real and standard pressure are the same value)

Thank you John! This was very helpful.

[QUOTE=stepht;61800]I could use some help trying to figure out how to convert ppm of CO2 gas into Pascals (Pa).

Any help would be greatly appreciated.

Thank you.

[JohnS]

[QUOTE=mkchaudhary;88892]

Originally Posted by stepht

I could use some help trying to figure out how to convert ppm of CO2 gas into Pascals (Pa).

Any help would be greatly appreciated.

Thank you.

Did you read post #2 where the question was answered?