Table 1.
The results of pore analysis of Yellow poplar (H: heartwood, M: intermediate wood, S: sapwood)

Sample	Bulk density (g/cm3)	Specimen true density (g/cm3)	Sawdust true density (g/cm3)	Total Porosity (%)	Closed pore porosity (%)	Through pore Porosity (%)	Blind pore porosity (%)	Max pore size (μm)	Mean pore size (μm)	Gas permeability (Darcy)
H1	0.393	1.073	1.510	73.992	10.598	35.441	27.953	5.183	0.234	0.207
H2	0.395	1.057	1.510	73.872	11.199	34.208	28.464	2.819	0.178	0.208
H3	0.462	1.074	1.510	69.396	12.420	29.107	27.869	4.385	0.343	0.408
H4	0.501	1.161	1.510	66.814	9.974	31.234	25.606	6.828	0.471	0.479
H5	0.353	1.116	1.510	76.606	8.270	38.777	29.559	10.421	0.758	1.332
M1	0.420	1.272	1.520	72.364	5.380	42.223	24.761	32.100	10.119	5.064
M2	0.441	1.190	1.520	70.954	8.075	36.238	26.641	24.295	1.668	1.960
M3	0.402	1.143	1.520	73.571	8.729	35.663	29.179	23.572	1.921	1.069
M4	0.439	1.243	1.520	71.115	6.423	41.103	23.589	32.593	13.960	8.844
M5	0.457	1.199	1.520	69.921	8.050	37.183	24.688	26.668	2.485	2.558
S1	0.441	1.307	1.530	71.187	4.917	46.585	19.685	30.938	8.359	16.401
S2	0.447	1.311	1.530	70.800	4.877	48.109	17.815	30.463	13.005	18.962
S3	0.388	1.304	1.530	74.624	4.396	50.530	19.698	34.285	16.001	16.791
S4	0.417	1.316	1.530	72.732	4.433	50.377	17.922	31.809	18.865	33.682
S5	0.453	1.321	1.530	70.389	4.675	43.448	22.267	29.227	5.957	5.322