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  #1  
Old 05-05-2009, 08:42 AM
stepht
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Question 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.
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  #2  
Old 05-05-2009, 08:52 AM
JohnS JohnS is offline
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Default 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)
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Old 05-05-2009, 09:38 AM
stepht
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Talking Re: convert ppm CO2 to Pa

Thank you John! This was very helpful.
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  #4  
Old 09-30-2012, 10:43 PM
mkchaudhary
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Default 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.
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  #5  
Old 10-01-2012, 01:56 AM
JohnS JohnS is offline
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Default Re: convert ppm CO2 to Pascals

[QUOTE=mkchaudhary;88892]
Quote:
Originally Posted by stepht View Post
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?
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