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- Mass per unit volume. The total mass (solids plus water) per total volume. The weight of soil per unit volume, usually the weight of soil in one cubic foot (unit weight). The weight of a substance per unit of volume of the substance; for example, water has a density of 62.4 pounds per 1 cubic foot. Number per unit area of individuals of any given species at any given time (see population density).
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- BW, Dry unit weight, Glacier (ice sheet), Low density material, Maximum unit weight, Parts Per Billion (ppb), Parts Per Million (ppm), Plumb Bob, Saturated unit weight, Specific weight, Unit weight, Unit weight of water, Wet unit weight