[Cboldt]

-- A micron is a measure of length --

"Screen size" is customarily a single dimension too, but the particles that get through are three dimensional. Similarly, filters are "micron rated."

That said, I think any radiation or chemical hazard is generally measured by mass.

[The_Media_never_lie]

"Screen size" is customarily a single dimension too, but the particles that get through are three dimensional. Similarly, filters are "micron rated."

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Ok, so it does make sense to speak of particles in the micron range. I stand corrected and have learned something on FR. Thanks!