What determines the specific weight of wood

What determines the specific weight of wood?

The specific weight of wood is unstable. This value depends directly on the moisture content of the rock. Density indicators can vary widely, even for one tree species. Therefore, the values ​​displayed in the tables are only generalized data. In practice, the values ​​of the density of wood differ from the table values ​​averaged in the literature and such correction is not considered an error.

Table of wood density

Tree species

Density
wood,
(kg / m)3)

Limit
density
wood,
(kg / m)3)

Ebony
(black)

1255

1255

Iron

1255

1175-1385

Oak

805

695-1025

Red tree

800

555-1050

Ash

755

525-955

Rowan

725

685-885

Apple tree

715

665-840

Beech

675

625-815

Acacia

665

575-845

Elm

655

555-815

Larch

630

545-660

Maple

655

535-810

Birch

645

510-765

Pear

655

615-730

Chestnut

645

600-710

Cedar

560

550-575

Pine

520

300-750

Linden

500

450-800

Alder

505

475-585

Aspen

475

465-545

Willow

480

450-580

Spruce

445

365-755

Verba

455

415-505

Walnut forest

435

425-455

Fir

415

345-600

Bamboo

400

390-405

Poplar

400

395-585

Important!In the table the data are given taking into account the moisture content of wood in 12%. For example, the specific weight of pine wood is 520 kg / m3.

What determines the indicator

The density of wood is determined by the breed. On this basis, average values ​​of the specific weight of wood are calculated, which are obtained due to repeated practical studies. In the process of carrying out a number of experiments with one rock, it is possible to obtain differing structural density densities. In fact, in one table presented above, data on the density of tree species collected from different sources are collected, which indicates the variability of the absolute and relative indices of the specific gravity of the wood.

Specific weight of pine wood

Wood density groups

It is generally accepted to calculate the specific weight of wood of different species with a moisture content of no more than 12%. This is a normative indicator, according to which wood is divided into three density groups:

  1. Low-density (up to 545 kg / m3). This category includes: spruce, pine, fir, cedar, juniper, poplar, linden, willow, aspen, alder (white and black), chestnut seedlings, walnut (white, gray, Manchurian), Amur velvet.
  2. Medium-dense (555-745 kg / m3) of the rock are represented by: larch, yew, birch (fluffy, fluffy, black, yellow), beech (eastern, European), elm, pear, oak, maple, hazel, walnut, plane tree, mountain ash, persimmon, apple, ash (common, Manchurian).
  3. High-density (over 755 kg / m3), among which: acacia, birch, iron, hornbeam, oak chestnut, iron tree, boxwood, pistachio, hops.

The figure below shows the diagram of the hardness of the wood. The values ​​are given in the coefficients.

Specific weight of different types of wood

How is the density of the rock associated with the flammability of the tree

Heat content of firewood (heating energyvalue) is determined based on the main indicator - the specific weight of wood. This is explained by direct dependence: the higher the density of the rock structure, the higher the percentage of the fuel content contained in it, and the better the fuel burns.

Specific weight of wood

Density indicators are actively used in construction, selecting materials for the construction of a house, a roof truss system, designing furniture, purchasing fuel for production.

Do without wood processing productsunreal. Having refused lumber, humanity can not exist fully. Therefore, research conducted with wood is of no small importance, because thanks to this engineers are able to design durable houses, produce solid and reliable furniture, and purchase high-quality raw materials for heating enterprises.

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