Conversion

Questions and answers on how to convert things from one unit or system to another

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Conversion

Postby Tagbede » Tue Apr 06, 2004 3:02 am

I like to convert from microgram/m3 to parts per million(ppm). How do I go about it?
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Re: Conversion

Postby Knight » Tue Apr 06, 2004 10:43 pm

Tagbede wrote:I like to convert from microgram/m3 to parts per million(ppm). How do I go about it?

The conversion factors are based on the molecular weights of the different contaminants and are different for each chemical.

For example, benzene's conversion factor for changing micrograms per cubic meter (µg/m³) to parts per million (ppm) is 0.00325.

Dividing the value of micrograms per cubic meter (µg/ m³) by 0.00325 will change the value to parts per million (ppm).

So, 10 µg/ m³ of benzene divided by 0.00325 is 3,076.9 ppm by volume in air.
William J. Knight
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Los Alamos National Labs
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Re: Conversion

Postby tvanellen » Wed May 25, 2005 2:13 am

I'm afraid there's an error here. 1 ppm benzene = 3.2 mg/m3 or 3200 microgram/m3. This means that 10 microgram/m3 benzene equals 1/320 or about 0.0031 ppm.
tvanellen
 

convertion microgram/m3 to ppm

Postby nurul hidayat » Thu Oct 27, 2005 12:26 pm

What is the general equation for this conversion?
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Conversion

Postby Eucharia Nwaichi » Thu Jul 23, 2009 4:19 pm

,Dividing the value of micrograms per cubic meter (µg/ m³) by 0.00325 will change the value to parts per million (ppm)' is wrong. Rather multiply the value of micrograms per cubic meter (µg/ m³) by 0.00325 will change the value to parts per million (ppm).
Eucharia Nwaichi
 


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