Definitions for "Parts per million"
Keywords:  ppm, milligram, solute, million, ppb
Number of parts of a chemical found in 1 million parts of a particular gas, liquid, or solid.
Ratio of amounts expressed as parts pesticide per 10 sample e.g. 1ppm = 1mg/kg. As with ppb it is recommended that SI units are used rather than ppm, particularly for weights to volume.
A common basis for reporting the results of water and wastewater analysis, indicating the number of parts by weight of a dissolved or suspended constituent, per million parts by weight of water or other solvent, In dilute water solutions, one part per million is practically equal to one milligram per liter, which is the preferred unit.