Discussion
Which of the following is NOT a physical property of a grain kernel?
Answer: B
Correct answer: Angle of repose
The angle of repose is a bulk property. It is the slope at which a poured heap stands, and a single kernel forms no heap and has no repose angle.
True density, sphericity and geometric mean diameter are all measured on the kernel itself - the first by displacement of the solid material, the other two from the three principal dimensions. Bulk density and porosity join the angle of repose on the bulk side. The distinction decides the measurement: kernel properties are averaged over a sample of individuals, bulk properties over a filled container.
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