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85-
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Suitable for Wood, Construction Field, New Materials Research
Technical data
Density is an important parameter for wood when measuring its physical character and mechanical character. As we know, Wood is a biological tissue made of cells, tracheides, and of walls composed of lignin. The tracheides are like pipes, transporting the sap along the stem till they are filled with water.
Wood density varies within the plant, during the life of the plant, and between individuals of the same species. Also the branches and the outer part of the trunk tend to have a lighter wood than that of the pith.
According to the definition of wood density, foresters measure the weight of a given volume of wood that has been ‘air-dried’. Depending on the standards of different countries, conventions differ about air drying: the fraction of water remaining in the wood sample may be 12%, or 15%. In the present study, wood density is technically defined as the ratio of the oven-dry mass of a wood sample divided by the mass of water displaced by its green volume (wood specific gravity, or WSG). This can be calculated from measurements of oven-dry weight combined with measurement of green volume.
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