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#1
05-05-2009, 09:42 AM
 stepht Guest Posts: n/a
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.
#2
05-05-2009, 09:52 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: convert ppm CO2 to Pa

Quote:
 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)
#3
05-05-2009, 10:38 AM
 stepht Guest Posts: n/a
Re: convert ppm CO2 to Pa

Thank you John! This was very helpful.
#4
09-30-2012, 11:43 PM
 mkchaudhary Guest Posts: n/a
Re: convert ppm CO2 to Pascals

[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.
#5
10-01-2012, 02:56 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: convert ppm CO2 to Pascals

[QUOTE=mkchaudhary;88892]
Quote:
 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.

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