parts per million (PPM)
Definition
Concentration by volume of one part of a gas (or vapor), or by weight of a liquid or solid, per million parts of air or liquid. One ppm is roughly equivalent to 5 liters of material in an Olympic-size swimming pool.
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parts per million (PPM) is in the Material & Occupational Safety subject.
parts per million (PPM) appears in the definitions of the following terms: mercury, threshold limit value (TLV), capability index (Cp), hard water, zero air, carbon dioxide (CO2), grains per gallon (GPG), lethal concentration 50 (LC50), concentration and petroleum gases
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