Discussion
A product at \( 4.0 \) kg water per kg dry matter has an equilibrium moisture of \( 0.12 \) on the same basis. Its free moisture content is
Answer: B
Correct answer: 3.88 kg per kg
Free moisture is the moisture present above the equilibrium value:
\[ X_{free} = X - X_{eq} = 4.00 - 0.12 = 3.88\ \mathrm{kg\ water\ per\ kg\ dry\ matter} \]
The distractor \( 4.12 \) adds instead of subtracting. Only the free moisture can be removed in air of this condition: drying rate curves fall to zero as the free moisture approaches zero, leaving the \( 0.12 \) behind however long the dryer runs.
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