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Specific surface of sand may be
EXPLANATION
Soil Solid Phase
- Specific Surface Area of Sand:
- Specific surface area ($S_w$) is inversely proportional to particle diameter ($S_w = \frac{6}{\rho \cdot d}$).
- Coarse sand grains ($0.05 - 2.0\text{ mm}$) have very small surface areas per unit mass, typically $\lt 2\text{ m}^2/\text{g}$ (often $0.01 - 0.1\text{ m}^2/\text{g}$), compared to $10 - 40\text{ m}^2/\text{g}$ for illite and up to $800\text{ m}^2/\text{g}$ for smectite clay. (Correct answer: Option 2)
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