Which unit is used to express the 4.5 pcf density comparison?

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Multiple Choice

Which unit is used to express the 4.5 pcf density comparison?

Explanation:
Density is mass per unit volume, so in earthwork contexts it’s expressed as weight per volume. The unit pounds per cubic foot measures how much weight sits in each cubic foot of material, which is exactly what a density comparison like 4.5 pcf represents. The other options describe different quantities: pounds per square foot is weight per area (not density), kilonewtons per square meter is a pressure unit, and pounds per cubic meter is a density unit but not the standard US customary form used here. So the appropriate unit for expressing that density comparison is pounds per cubic foot.

Density is mass per unit volume, so in earthwork contexts it’s expressed as weight per volume. The unit pounds per cubic foot measures how much weight sits in each cubic foot of material, which is exactly what a density comparison like 4.5 pcf represents. The other options describe different quantities: pounds per square foot is weight per area (not density), kilonewtons per square meter is a pressure unit, and pounds per cubic meter is a density unit but not the standard US customary form used here. So the appropriate unit for expressing that density comparison is pounds per cubic foot.

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