One thousanth of a gram is
one milligram and 1000 ml is
one liter, so that
1 ppm =
1 mg per liter = mg/Liter.
PPM is derived from the fact that the density of water is taken as 1kg/L = 1,000,000 mg/L, and 1mg/L is 1mg/1,000,000mg or
one part in
one million.
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