?PPM verses %

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Sep 18, 2002
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Might be a stupid question but if a lab sends you a SOOT 31 instead of SOOT .4%, how do you use the information SOOT 31? I presume it is 31ppm but how does that help?
 
I was going to ask you if that was a typo in the other thread. I don't believe it's 31ppm. And I've never seen a .31 ???
 
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