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- 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.
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- 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