If porosity n = 0.25, what is the approximate void ratio e?

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

If porosity n = 0.25, what is the approximate void ratio e?

Explanation:
Porosity is the fraction of the total volume that is pore space, while the void ratio compares the volume of voids to the volume of solids. They’re linked by the simple relation e = n/(1 − n). With porosity 0.25, the void ratio becomes e = 0.25 / 0.75 ≈ 0.333. So about one third, which matches the given value. If you check the other numbers, they would require different porosity values (for example, e = 0.50 would need n ≈ 0.333, e = 0.75 would need n ≈ 0.429, etc.).

Porosity is the fraction of the total volume that is pore space, while the void ratio compares the volume of voids to the volume of solids. They’re linked by the simple relation e = n/(1 − n). With porosity 0.25, the void ratio becomes e = 0.25 / 0.75 ≈ 0.333. So about one third, which matches the given value. If you check the other numbers, they would require different porosity values (for example, e = 0.50 would need n ≈ 0.333, e = 0.75 would need n ≈ 0.429, etc.).

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