Discussion
Which statement about porosity is FALSE?
Answer: C
Correct answer: It equals bulk density divided by true density
That ratio is the solid fraction, not the void fraction. Porosity is its complement:
\[ \varepsilon = 1 - \frac{\rho_b}{\rho_t} \]
The other three statements are sound. Porosity near 0.4 is typical of cereal lots; it governs airflow resistance in a drying bed, since the air must pass through the voids; and it is by definition the void fraction of the bulk volume. Wheat at 790 and 1360 kg/m\(^3\) gives a ratio of 0.58 and a porosity of 0.42 - two clearly different numbers, which is the quickest check on the false statement.
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