Comprehensive Fractal Description of Porosity of Coal of Different Ranks

Figure 1

Statistical relationship between  log[𝑑𝑉_𝑝(𝑟)/𝑑𝑝(𝑟)]  and  log[𝑝(𝑟)].

(a) Number 1 coal sample

(b) Number 2 coal sample

(c) Number 3 coal sample

(d) Number 4 coal sample