Application of a Modified Low-Field NMR Method on Methane Adsorption of Medium-Rank Coals

Table 3

Data of the volumes of the reference cell, sample cell, and pipeline from the modified low-field NMR method.

Sequence		Condition			Parameters
		1	2	3
First time	(MPa)	1.62	1.99	1.89	39.6693	8.0854	41.5012
	(MPa)	0.72	1.32	1.57
Second time	(MPa)	2.51	1.72	2.19	38.6185	7.8713	41.4746
	(MPa)	1.12	1.14	1.83
Third time	(MPa)	2.56	2.65	2.72	38.7619	8.3061	40.7465
	(MPa)	1.13	1.76	2.24
Average					39.0166	8.0876	41.2407

and stand for the injection pressure and equilibrium pressure, respectively.