ppm

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Abbreviation for the expression of concentration, parts per million. For solid and liquid concentrations, ppm refers to weight (mass) units. For example:

The relationship of ppm to weight percentage is 10,000 ppm = 1 wt%. For gases, ppm refers to volume (or mole) units. For example, H2S in an air sample may be 10 ppm (both by volume and by moles).

See: dissolved solidsepmLC50milligrams per liter

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