Parts Per Billion (ppb)
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- 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
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