What does ppm or ppb mean?
ppm (by mass). One liter (L) of pure water at 4ºC and 1 standard atmosphere pressure weighs exactly 1 kg, so 1 mg/L is 1 ppm. Another way to say it is a liter of water weighs 1,000 grams or 1 million mil-ligrams. Therefore, 1 mg in 1 liter is l mg in 1 million mil-ligrams or 1 part per million. What is ppb? An even smaller concentra- ................
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