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Patricia_a Commentator Join Date: Feb 2009 Location: Timisoara, Romania Posts: 59 Good Answers: 3	Converting Chemistry Units of Measure 06/26/2009 3:27 AM
	Converting ppm to ug/m3. The formula I have is x [ug/m3] = (C [ppm] x p x M) / (R x T) where p is pressure and I used p= 1 atm M is molar mass, R=8.3 gas constant and T is temperature in Kelvin Is this a good formula? I'm no chemist so please be very clear and simple. Thanks! __________________ Patricia_a
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TVP45 Guru Join Date: Jul 2007 Posts: 3354 Good Answers: 81	#1 Re: Converting ppm to ug/m3 06/26/2009 12:29 PM
	Some context, please? __________________ "If you aren't gonna shovel coal, keep your hands off the train whistle!" - Jr. Zirk

sb Guru Join Date: Mar 2007 Location: India Posts: 2593 Good Answers: 102	#2 Re: Converting Chemistry Units of Measure 06/26/2009 10:16 PM
	Got this from net http://www.lenntech.com/calculators/converter-parts-per-million.htm#Documentation see the documentation part Hope it helps __________________ Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches

Patricia_a Commentator Join Date: Feb 2009 Location: Timisoara, Romania Posts: 59 Good Answers: 3	#4 In reply to #2 Re: Converting Chemistry Units of Measure 06/30/2009 3:32 AM
	Thanks for the web page! Unfortunately, it only made me more confused! :( I think I need to find a chemist to talk to in real life! __________________ Patricia_a

Parvish Kumar FJ Active Contributor Join Date: Jun 2009 Location: Suva, FIJI Islands Posts: 15	#3 Re: Converting Chemistry Units of Measure 06/29/2009 8:08 PM
	why are you using pressure and R values for conversion....are you trying to derive it from teh formula PV= nRT cheers

Patricia_a Commentator Join Date: Feb 2009 Location: Timisoara, Romania Posts: 59 Good Answers: 3	#5 In reply to #3 Re: Converting Chemistry Units of Measure 06/30/2009 3:34 AM
	Yes, I am, just that I don't know exactly the relationship between ppm and ug/m3.... that formula was the only one I found so far. __________________ Patricia_a

Parvish Kumar FJ Active Contributor Join Date: Jun 2009 Location: Suva, FIJI Islands Posts: 15	#6 In reply to #5 Re: Converting Chemistry Units of Measure 06/30/2009 6:06 PM
	ppm or parts per million is simply like 1mg per litre or 1 mg/1000 cubic centimeter... therefore 1ug/L would be 1ppb or 1 parts per billion or 0.001ppm cheers

Patricia_a Commentator Join Date: Feb 2009 Location: Timisoara, Romania Posts: 59 Good Answers: 3	#7 In reply to #6 Re: Converting Chemistry Units of Measure 07/01/2009 3:33 AM
	Not quite... when you measure gas concentration, ppm is in volume and is equivalent to something like mL/L, not mg/L. And to convert gas volume into mass, as far as I know, the pV=vRT formula is the only way. Just think about a balloon - even if it has the same mass, it can have a different volume at a different temperature or pressure. The main thing I'm not sure of is what value to use for pressure - do you think 1 atm is correct? __________________ Patricia_a

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