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The micrometer (symbol: μm) or micrometre (UK & International spelling), also commonly known as a micron, is an SI derived unit of length equaling 1×10−6 of a meter (SI standard prefix "micro-" = 10−6); that is, one millionth of a meter (or one thousandth of a millimeter, 0.001 mm, or about 0.000039 inch). The symbol μm is sometimes rendered as um if the symbol μ cannot be used, or if the writer is not aware of the distinction.

The micrometer is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria and is also commonly used in plastics manufacturing. Micrometers are the standard for grading wool by the diameter of the fibers; wool finer than 25 μm can be used for garments, while coarser grades are used for outerwear, rugs, and carpets. The width of a single human hair ranges from approximately 10 to 200 μm. The first and longest human chromosome is 10μm in length.

Symbol/abbreviation: μm
Unit of: LENGTH
LENGTH's base unit: meters (SI Unit)
In relation to the base unit (meters), 1 Micrometers = 1.0E-6 meters.
[Conversion table] 1 Micrometers (μm) to all length units
1 μm= 0.000551181102361 agate [typography] (agate)
1 μm= 1.68413110624E-6 alens (aln)
1 μm= 10000 angstroms (Å)
1 μm= 6.68458712227E-18 astronomical unit (au)
1 μm= 1.0E+12 attometers (am)
1 μm= 8.46668360003E-9 barleycorns (bcorn)
1 μm= 1000000 bicrons (μμ)
1 μm= 18897.2687777 bohr radius (Bohr)
1 μm= 5.39611824838E-9 cable length uk (cbl[UK])
1 μm= 4.55672207641E-9 cable length us (cbl[US])
1 μm= 0.00393700787402 calibers (cal)
1 μm= 0.00393700787402 centiinch (cin)
1 μm= 0.0001 centimeters (cm)
1 μm= 4.9709695379E-8 chains (ch)
1 μm= 2.18722659668E-6 cubits (cbt)
1 μm= 1.0E-7 decameters (dam)
1 μm= 1.0E-5 decimeters (dm)
1 μm= 0.00265977096574 didot points (didot point)
1 μm= 5.24934383202E-5 digits (digit)
1 μm= 8.7489063867E-7 ells (eel)
1 μm= 0.000237106301584 ems (EM)
1 μm= 1.0E-24 exameters (Em)
1 μm= 5.46806649169E-7 fathoms (fath)
1 μm= 3.28083989501E-6 feet (ft)
1 μm= 1000000000 femtometers (fm)
1 μm= 1000000000 fermi (fermi)
1 μm= 8.7489063867E-6 finger cloth (finer)
1 μm= 4.4994375703E-5 fingerbreadth (fb)
1 μm= 3.18369945877E-6 fods (fod)
1 μm= 4.9709695379E-9 furlongs (fur)
1 μm= 1.0E-15 gigameters (Gm)
1 μm= 3.24675324675E-8 greek plethron (pleth)
1 μm= 5.40540540541E-9 greek stadion (std)
1 μm= 9.84251968504E-6 hands (h)
1 μm= 1.0E-8 hectometers (hm)
1 μm= 0.1 himetrics (hiMetric)
1 μm= 5.27291600861E-7 hvats (hvat)
1 μm= 3.93700787402E-5 inches (in)
1 μm= 1.0E-9 kilometers (km)
1 μm= 3.24044069994E-26 kiloparsecs (kpc)
1 μm= 3.861003861E-20 light days (ld)
1 μm= 9.26784059314E-19 light hours (lh)
1 μm= 5.55864369094E-17 light minutes (lmin)
1 μm= 1.28683567108E-21 light months (lm)
1 μm= 3.33555703803E-15 light seconds (ls)
1 μm= 1.05697072191E-22 light years (ly)
1 μm= 0.00047619047619 lines (l)
1 μm= 4.97095959595E-6 links (li)
1 μm= 1.0E-12 megameters (Mm)
1 μm= 1.0E-6 meters (m)
1 μm= 39.3700787402 microinches (μin)
1 μm= 1 micrometers (μm)
1 μm= 1000000 micromicrons (μμm)
1 μm= 6.21371192237E-10 miles (mi)
1 μm= 0.001 millimeters (mm)
1 μm= 0.0393700787402 mils (mil)
1 μm= 1.0E-10 myriameters (Mym)
1 μm= 1.74978127734E-5 nails cloth (nail)
1 μm= 1000 nanometers (nm)
1 μm= 1.79985601152E-10 nautical leagues (Nl)
1 μm= 5.39956803456E-10 nautical miles (NM)
1 μm= 1.31233595801E-6 paces (pace)
1 μm= 1.31233595801E-5 palms (palm)
1 μm= 3.24077928944E-23 parsecs (pc)
1 μm= 1.98838781516E-7 perch (perch)
1 μm= 1.0E-21 petameters (Pm)
1 μm= 0.000236220472627 picas (p)
1 μm= 1000000 picometers (pm)
1 μm= 0.00377952803522 pixels (PX)
1 μm= 6.25E+28 planck length (pl)
1 μm= 0.00283464388369 points (pt)
1 μm= 1.98838781516E-7 poles (pole)
1 μm= 2.24971878515E-5 rack unit (ru)
1 μm= 0.000236220502201 rems (rem)
1 μm= 1.98838781516E-7 rods (rd)
1 μm= 2.81690140845E-8 roman actus (actus)
1 μm= 1.64041994751E-7 ropes (rope)
1 μm= 1.0E-10 scandinavian miles (mil[Scandinavian])
1 μm= 4.37445319335E-6 spans (span)
1 μm= 1.0E-18 terameters (Tm)
1 μm= 0.0393700787402 thou (th)
1 μm= 0.0566925562674 twips (twip)
1 μm= 1.15473441109E-6 varas [Argentina] (vr[Argentina])
1 μm= 1.19303029791E-6 varas [California] (vr[California])
1 μm= 1.15740740741E-6 varas [Latin America] (vr[Latin])
1 μm= 1.19328894298E-6 varas [Mexico] (vr[Mexico])
1 μm= 1.19631534873E-6 varas [Spanish] (vr[Spanish])
1 μm= 1.18109771221E-6 varas [Texas] (vr[Texas])
1 μm= 9.37382827147E-10 versts (vst)
1 μm= 9980000.07984 x unit (xu)
1 μm= 1.09361329834E-6 yards (yd)
1 μm= 1.0E+18 yoctometers (ym)
1 μm= 1.0E-30 yottameters (Ym)
1 μm= 1.0E+15 zeptometers (zm)
1 μm= 1.0E-27 zettameters (Zm)
1 μm= 3.93700787402E-5 zolls (zoll)
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