Parts Per Billion (ppb)
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- Number of parts of a chemical found in one billion parts of a particular gas, liquid, or solid mixture. See concentration.
EPA - Cite This Source - This Definition - Number of parts of a chemical found in one billion parts of a particular gas, liquid, or solid mixture. See concentration.
EPA - Cite This Source - This Definition - Coal gasification, Coal liquefaction, Condensation, evaporation, Municipal Solid Waste (MSW), Parts Per Million (ppm), Sublimation
- A measurement of concentration on a weight or volume basis. Equivalent to micrograms per liter. One ppb is equivalent to one drop of water in 55,000 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 Million (ppm), Plumb Bob, Saturated unit weight, Specific weight, Unit weight, Unit weight of water, Wet unit weight