Table 9 Gray correlation averages of factors influencing heterogeneity.

From: Gas adsorption analysis of pore structure differences and influencing factors in coal with varying metamorphic grades

Influencing factor

Parameters of pore structure

Basic parameters of coal samples

Degree of coalification

V

S

Moisture

Ash content

Volatile content

Fixed carbon

Vitrinite reflectance

Filled pores

0.776

0.778

0.857

0.653

0.908

0.943

0.725

0.777

0.840

0.725

Diffusion pores

0.659

0.743

0.907

0.739

0.938

0.959

0.781

0.701

0.886

0.781

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