Discussion
Free moisture content is defined as
Answer: B
Correct answer: The moisture above the equilibrium value
Free moisture is the moisture present in excess of the equilibrium value for the surrounding air - the part that can actually be removed by drying in those conditions:
\[ X_{free} = X - X_{eq} \]
The distinction matters because drying rate curves are plotted against free moisture, not total moisture: the rate falls to zero when the free moisture reaches zero, whatever the total may be. Total moisture includes the equilibrium fraction, and bound moisture is that held so firmly in the structure that it exerts a lowered vapour pressure.
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