Question Bank • QB_APE_EXP_086 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Storage Systems

Subtopic: Packaging material and machines

Question Statement:

A plastic film pouch with a surface area of $0.05\text{ m}^2$ has a water vapor transmission rate (WVTR) of $4.0\text{ g/(m}^2\cdot\text{day)}$ at $38^\circ\text{C}$ and $90\%$ RH gradient. Calculate the mass of water vapor in $\text{grams}$ that permeates through the pouch in $30\text{ days}$.

Answer Key:

6

Step-by-Step Solution & Explanation

$\text{Mass permeated} = \text{WVTR} \times A \times t$ $\text{Mass} = 4.0\text{ g/(m}^2\cdot\text{day)} \times 0.05\text{ m}^2 \times 30\text{ days} = 6.0\text{ g}$
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