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.
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10,000 um = 1 cm
1000 microns
1 metre = 1 million microns so 0.000351 metres = 351 microns
914,400 microns, algebraic steps below: 1 yd*36 in 1 yd*2.54 cm 1 in*1 microns 0.0001 cm=914,400 microns
1 meter =1,000,000 microns 1 km = 1000 meters 1 km = 1,000,000,000 microns ( one billion)