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usually in the parts per million (ppm) range, but often up to 1–2% - Which is it? Commonly in the ppm range or commonly in the percent range? 93.97.30.204 ( talk) 13:29, 16 February 2011 (UTC) reply

From Wikipedia, the free encyclopedia

Untitled

usually in the parts per million (ppm) range, but often up to 1–2% - Which is it? Commonly in the ppm range or commonly in the percent range? 93.97.30.204 ( talk) 13:29, 16 February 2011 (UTC) reply


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