Why microns for powders?

Laser diffraction and microscopy habitually report particle size in µm.

How do I relate this to mesh?

Compare against handbook openings — mesh values remain nominal.

Multiply millimeters by 1,000 to express the same distance in micrometers.

Millimeters (mm)

Microns (µm)

150

How many microns is 0.25 mm?: 250 µm.
Why microns for powders?: Laser diffraction and microscopy habitually report particle size in µm.
How do I relate this to mesh?: Compare against handbook openings — mesh values remain nominal.