Ppm

Abbreviation for "parts per million". Ppm stands for a numerical value expressed in millionths of a part: 1 ppm = 1 part per million = 0.0001%. In simpler terms: one ppm is one per mille of one per mille. Depending on the context, one millionth (ppm) corresponds to

as a mass fraction: 1 mg/kg (milligram per kilogram)
as volume concentration: 1 ml/m³ (millilitre per cubic metre)
as a quantity of substance: 1 µmol/mol (micromole per mole)

Like ppb and ppt, ppm is used to specify extremely low concentrations of substances in gases, liquids or solids. Such units of measurement are commonly used in the natural sciences, environmental analysis, food monitoring and in viticulture, for example when specifying residues, flavourings or concentrations below the level of perception. The values are usually determined using analytical methods such as chromatography.

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