a) Water vapour transmission rate
b) Water vapour transient rate
c) Water vapour transfer rate
d) Water to vapour total ratio
Answer: a
Explanation: The term WVTR related to packaging films stands for Water vapour transmission rate. It is the rate by which water vapour/moisture permeates through a plastic film. The plastic films having a greater water vapour transmission rate is a poor barrier against water vapour or moisture.
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