Nitrocellulose fibers with an initial total water content of 40 wt% (dry basis) are dried in trays in a tunnel dryer operating at 1 atm. If the fibers are brought to equilibrium with air at 25?C and a relative humidity of 30%, determine the kg of moisture evaporated per kg of bone-dry fibers. The equilibrium-moisture content of the fibers is given in Figure.

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1- paper, newsprint 2- wool, worsted 3- nitrocellulose 4- silk 5- leather, sole, oak tanned 6- kaolin 0.28 0.24 7- N.C. tobacco leaf 8- soap 9- glue 10- lumber 0.20 0.16 10 0.12 0.08 0.04 40 60 80 100 Percent relative humidity Moisture content in solids, Ib water/lb dry solids