Discussion
Match each term in List I with its definition in List II.
List I
A. Water activity
B. Equilibrium moisture content
C. Hysteresis
D. Rehydration ratio
List II
1. Moisture at which grain neither gains nor loses water
2. The availability of water for microbial activity
3. Rehydrated mass divided by dried mass
4. The gap between adsorption and desorption isotherms
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Water activity measures the availability of water for microbial activity, being the ratio of vapour pressure over the product to that over pure water. Equilibrium moisture content is the value at which the grain neither gains nor loses water to its surrounding air.
Hysteresis is the gap between the adsorption and desorption isotherms, so that the same relative humidity corresponds to two different moisture contents depending on the sample's history. Rehydration ratio is rehydrated mass divided by dried mass, a quality index for dried products - the only one of the four that is a simple mass ratio rather than a thermodynamic quantity.
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