Using only the linear part of the moisture absorption curve for a temperature of \(77^{\circ} \mathrm{C}\) in Figure 5.12, and assuming a thickness of \(2.54 \mathrm{~mm}\), estimate the diffusivity \(D_{z}\). Compare this value with the estimate from Figure 5.11.

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FIGURE 5.11 Diffusivity, D (mm2/s) 10-6 400 Temperature, T (K) 350 300 P(-5722) Dave = 6.51 exp T 10-7 10-8 Present data Delasi and Whiteside (1978) Whitney and Browning (1978) 1 2.4 2.6 2.8 3.0 3.2 3.4 3.6 1/Tx 103 (1/K)