Density (wood)

medium densities in the fresh forest

European beech	558 kg / m3
English oak and sessile oak	571 kg / m3
Norway spruce	379 kg / m3

The space density is a measure in wood technology . It sets the amount of wood substance ( dry matter ) in relation to the volume of the swollen state ( fresh wood ):

${\displaystyle \rho _{\text{raum}}={\frac {m_{\text{trocken}}}{V_{\text{frisch}}}}}$

The bulk density is usually given in  kilograms per  solid cubic meter  (kg / fm). This helps to avoid confusion with the kiln density , which shows the dry matter in relation to the dry volume in cubic meters .

Since wood shrinks below the fiber saturation range during drying , the volume density below this point depends on the humidity and must be designated accordingly. Example:

${\displaystyle r_{14}={\frac {\text{Darrgewicht}}{\text{Holzvolumen}}}\ {\text{bei}}\ 14\,\%\ {\text{Holzfeuchte}}}$

If the shrinkage rate of the respective wood species is known , the volume density can be converted into kiln density.

Individual evidence

1. ↑ Reinhold Erlbeck, Ilse Haseder and Gerhard KF Stinglwagner : Das Kosmos Wald- und Forstlexikon. Franckh cosmos. Stuttgart 1998. ISBN 3-440-07511-7 , page 872