Wet lumber of the type in figure is slowly dried from an initial total moisture content of 50 wt% to a moisture content in equilibrium with atmospheric air at 25?C and 40% relative humidity. Determine:

(a) The unbound moisture in the wet lumber before drying in lb water/lb bone-dry lumber.

(b) The bound moisture in the wet lumber before drying in lb water/lb bone-dry lumber.

(c) The free moisture in the wet lumber before drying, referred to as the final dried lumber, in lb water/lb bone-& lumber.

(d) The lb of moisture evaporated per lb of bone-dry wood.

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1- paper, newsprint 2- wool, worsted 3- nitrocellulose 4- silk 5- leather, sole, oak tanned 0.28 6- kaolin 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 20 Percent relative humidity Moisture content in solids, Ib water/lb dry solids