For a soil mass, volume of voids is 0.5 m³ and total volume is 1.0 m³. Porosity is

Why is this the answer?

Porosity n = (Vv / V) × 100%, where Vv is volume of voids and V is total volume of soil mass. n = (0.5 / 1.0) × 100 = 50.0%. Porosity indicates the fraction of total soil volume occupied by voids (air + water). Typical values: gravel 25–40%, sand 30–45%, clay 40–60%.

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