A soil sample weighs 30 kN and occupies 1.0 m³. Bulk unit weight is

Why is this the answer?

Bulk (wet) unit weight γ = W / V, where W is total weight of the soil mass and V is total volume. γ = 30 / 1.0 = 30 kN/m³ kN/m³. Bulk unit weight includes weight of solids plus pore water. Typical values: loose sand ~16 kN/m³, dense sand ~20 kN/m³, saturated clay ~18–22 kN/m³.

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