Discussion
A grain bed of porosity \( 0.40 \) occupies \( 2.5 \) m\(^3\). The volume of air within it is
Answer: B
Porosity is the void fraction, so the air volume is \( 0.40 \times 2.5 = 1.0 \) m\(^3\). That air is both the path along which drying air travels and the reason a grain bed conducts heat so poorly that hot spots persist.
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