Table 5 The average roughness Ra and root mean square roughness Rq of different coal samples.
From: Effects of pre-fracturing fluids on pore-fracture structure and mechanical properties of deep coal
CS-0 | CS-1 | CS-2 | CS-3 | CS-4 | CS-5 | |
|---|---|---|---|---|---|---|
Ra(nm) | 0.11 | 0.115 | 0.184 | 0.222 | 0.179 | 0.169 |
Rq(nm) | 0.137 | 0.149 | 0.227 | 0.285 | 0.221 | 0.212 |
