Table 1. Physical Properties of Different Tree Species.

wood species	air-dry density relative (g/cm3)	water content (%)	thickness (mm)
B. alnoides (A)	0.65	9.98	0.51
Chinese fir (B)	0.39	11.37	0.40
basswood (C)	0.44	8.59	0.43
New Zealand pine (D)	0.31	10.03	0.50
oguman (E)	0.30	9.31	0.15
black walnut (F)	0.49	9.79	0.44