Assertion: charcoal | /r/HasProperty | . 1.1
Facets:
Source sentences:
text: Traditional charcoaling producing the fuel inside simple earthen kilns (wood covered by mud or turf) was very inefficient, with only 15–25% of the mass of the dry charged wood converted to charcoal; in volume terms more than 20 m3, and only rarely less than 10 m3 of wood were consumed to produce a tonne of charcoal (Fig. 1.1).