wood is movement which is them water
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Wood moves as its moisture content changes. In a tree that's just been felled, the wood is “green” — sap fills the cell cavities. This free water (as the sap is sometimes called) accounts for 72 percent of the total moisture content, although this percentage may vary from species to species.
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Wood can absorb water as a liquid, if in contact with it, or as vapour from the surrounding atmosphere. Although wood can absorb other liquids and gases, water is the most important. Because of its hygroscopicity, wood, either as a part of the living tree or as a material, always contains moisture.
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