Wood
From The Art and Popular Culture Encyclopedia
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| + | [[Image:Der Abend.jpg |thumb|right|200px|''[[Der Abend]]'' ([[1820]]) by [[Caspar David Friedrich]]]] | ||
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| - | '''Wood''' is a hard, fibrous tissue found in many trees. It has been used for hundreds of thousands of years for both [[fuel]] and as a construction material. It is an organic material, a natural [[composite material|composite]] of [[cellulose]] fibers (which are strong in tension) embedded in a [[:wikt:matrix|matrix]] of [[lignin]] which resists compression. Wood is produced as secondary [[xylem]] in the stems of trees (and other woody plants). In a living tree it performs a support function, enabling woody plants to grow large or to stand up for themselves. It also mediates the transfer of water and [[nutrients]] to the [[leaves]] and other growing tissues. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber. | + | '''Wood''' is a hard, fibrous tissue found in many trees. It has been used for hundreds of thousands of years for both [[fuel]] and as a construction material. It is an organic material, a natural [[composite material|composite]] of [[cellulose]] fibers (which are strong in tension) embedded in a [[matrix|matrix]] of [[lignin]] which resists compression. Wood is produced as secondary [[xylem]] in the stems of trees (and other woody plants). In a living tree it performs a support function, enabling woody plants to grow large or to stand up for themselves. It also mediates the transfer of water and [[nutrients]] to the [[leaves]] and other growing tissues. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber. |
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Revision as of 13:03, 25 September 2013
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Wood is a hard, fibrous tissue found in many trees. It has been used for hundreds of thousands of years for both fuel and as a construction material. It is an organic material, a natural composite of cellulose fibers (which are strong in tension) embedded in a matrix of lignin which resists compression. Wood is produced as secondary xylem in the stems of trees (and other woody plants). In a living tree it performs a support function, enabling woody plants to grow large or to stand up for themselves. It also mediates the transfer of water and nutrients to the leaves and other growing tissues. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber.
