um and micron are the exact same so no conversion. The u should ideally be the greek letter mu but this is often difficult to type and it sufficiently looks like a u
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14 grams per micron
please convert 140 microns to GSM
Convert both to the same unit, then compare. 1 mm = 1000 micron.
Multiply mm by 1,000 to get um. 67.5 mm = 67,500 um
um means micrometer, which is the same as micron. The "u" is supposed to be the Greek letter "mu", but if you can't produce that on a specific keyboard, or in a specific program, "u" is commonly substituted.