Comprehensive Fractal Description of Porosity of Coal of Different Ranks

Table 5

Experimental results of specific surface area of coal samples obtained by liquid nitrogen adsorption method.

Sample number	Specific surface area of pore (m²/g)				Specific surface area ratio of pore (%)
	𝑆2	𝑆3	𝑆4	𝑆𝑡	𝑆2/𝑆𝑡	𝑆3/𝑆𝑡	𝑆4/𝑆𝑡
Number 1	0.066	0.449	1.377	1.892	3.49	23.73	72.78
Number 2	0.060	0.376	0.71	1.146	5.24	32.81	61.95
Number 3	0.058	0.772	10.457	11.287	0.51	6.84	92.65
Number 4	0.032	0.411	5.169	5.612	0.57	7.32	92.11

Note: the aperture structure classification is the same as that of Table 4.