Discussion
Match each moisture term in List I with its meaning in List II.
List I
A. Free moisture
B. Bound moisture
C. Critical moisture
D. Equilibrium moisture
List II
1. Held at a vapour pressure below that of pure water
2. Moisture above the equilibrium value
3. In balance with the surrounding air
4. Where the constant rate period ends
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Each moisture term is matched to its meaning. Free moisture (A) is that above the equilibrium value (2) and therefore removable. Bound moisture (B) is held at a vapour pressure below that of pure water (1), which is what makes it hard to remove.
Critical moisture (C) is where the constant rate period ends (4) and control passes to internal diffusion. Equilibrium moisture (D) is that in balance with the surrounding air (3), the floor no dryer can pass with that air. Note the relation: free moisture is measured from the equilibrium value upward, so the two definitions are complementary.
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