原文由 ruojun 发表:
The term, "grit" refers to "the size of the abrasive particle or the mesh number. This is the number of holes per linear inch in a sieve" (Stafford, 1980).
Some find this hard to believe. Consider some 320-grit abrasive paper. The abrasive particles were passed through a screen that had 320 wires per linear inch, not per square inch. In a square inch there would be 320 x 320 openings, or 102,400 openings in this wire mesh.
Larger grit numbers indicate "finer" abrasive sizes, and smaller numbers indicate "coarser" sizes.