Parts Per Million (ppm)
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- Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration.
EPA - Cite This Source - This Definition - Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration.
EPA - Cite This Source - This Definition - Coal gasification, Coal liquefaction, Condensation, evaporation, Municipal Solid Waste (MSW), Parts Per Billion (ppb), Sublimation
- A measurement of concentration on a weight or volume basis. Equivalent to milligrams per liter (mg/l). One ppm is comparable to one drop of water in 55 gallons.
Bureau of Reclamation - Cite This Source - This Definition - BW, density, Dry unit weight, Glacier (ice sheet), Low density material, Maximum unit weight, Parts Per Billion (ppb), Plumb Bob, Saturated unit weight, Specific weight, Unit weight, Unit weight of water, Wet unit weight