Discussion
If 100 \(\text{cm}^{3}\) of soil has an oven dry weight of 135 grams, what is its bulk density ?
Answer: A
The bulk density is \(1.35\ \text{g/cm}^{3}\).
Bulk density is the oven-dry mass of soil divided by its total volume:
\[ \begin{aligned} \rho_b &= \frac{\text{dry mass}}{\text{volume}} \\ &= \frac{135\ \text{g}}{100\ \text{cm}^{3}} = 1.35\ \text{g/cm}^{3} \end{aligned} \]
The distractors come from common slips. 1.53 reverses the digits; 13,500 multiplies mass by volume instead of dividing; and 0.75 (strictly about 0.74) is volume divided by mass, which also has the wrong units. A value of 1.35 is typical of a mineral soil.
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