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

Important! The table shows the data taking into account the moisture content of wood in 12%. For example, the specific weight of pine wood is 520 kg / m ³ .

What determines the indicator

The density of wood is determined by the rock. 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 series 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 parameters of the specific gravity of the wood.

Wood density groups

It is generally accepted to calculate the specific weight of wood of different breeds 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 / m ³ ). This category includes: spruce, pine, fir, cedar, juniper, poplar, linden, willow, aspen, alder (white and black), chestnut sown, walnut (white, gray, Manchurian), Amur velvet.
2. The medium-dense rocks (555-745 kg / m ³ ) are represented by: larch, yew, birch (povily, fluffy, black, yellow), beech (eastern, European), elm, pear, oak, maple, hazel, walnut, Rowan, persimmon, apple, ash (common, Manchurian).
3. High-density (over 755 kg / m ³ ), among which: acacia, birch, 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.

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

The calorific value of firewood (heating energy value) 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 combustible contained in it, and the better the fuel burns.

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

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