MESH and MICRON SIZES
Mesh size usually is referring to the mesh number (a US measurement ... cement dust 3 to 100 cinnamon (ground) 70 to 200 clay to 2 coal dust 1 to 100 coffee (ground) 5 to 400 concrete dust 3 to 100 copier toner to 15 corn starch to dust (atmospheric) to 40