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    Author(s): Roger M. Rowell
    Date: 2005
    Source: Handbook of wood chemistry and wood composites. Boca Raton, Fla. : CRC Press, 2005: pages 77-98.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (445 KB)

    Description

    Wood was designed by nature over millions of years to perform in a wet environment. The wood structure is formed in a water-saturated environment in the living tree, and the water in the living tree keeps the wood elastic and able to withstand environmental strain such as high wind loads. We cut down a tree, dry the wood, and mainly use it in its dry state. But wood in use remains a hygroscopic resource. Wood’s dimensions and mechanical, elastic, and thermal properties depend on the moisture content. Wood is also anisotropic, which means that its properties vary according to its growing direction (longitudinal [vertical or length direction], tangential [parallel to annual growth rings], and radial [perpendicular to the annual growth rings]). The mechanical properties depend very much on both moisture content and growing direction.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Rowell, Roger M. 2005. Moisture properties. Handbook of wood chemistry and wood composites. Boca Raton, Fla. : CRC Press, 2005: pages 77-98.

    Keywords

    Electric properties, plant cell walls, adsorption, absorption, mechanical properties, wood moisture, elasticity, thermal properties, anisotropy, dimensional stability, swelling, moisture content, wood strength, hygroscopicity

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