a) gm2/hr
b) g/m224hr
c) g/m2hr
d) g/cm224hr
Answer: b
Explanation: WVTR – Water vapour transmission rate is expressed as gm2/24hr. WVTR is the quantity of water vapour in gram that will permeate from one side of a film of an area 1m2 to other in 24 hours.
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