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You are here: Home / Explanatory Dictionary / Parts Per Million

Parts Per Million

(ppm) a common basis for reporting the results of water and wastewater analyses, 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.

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Water Quality Specialists

Definitioner

Solvent
the liguid, such as water, in which other materials (solutes) are dissolved
PPM
the abbreviation for part per million.
Milligram per liter
a unit concentration of matter used in reporting the results of water andwaste-water analyses. In dilute water solutions, it is practially equal to the part per million, but varies from the ppm in concentrated solutions such as brine. As most analyses are performed on measured volumes of water, the mg/l is a more accurate expression of the concentration, and is the preferred unit of measure.
Liter
the basic metric unit of volume; 3,785 liters equals 1 U.S. gallon; 1 liter of water weighs 1000 grams.