ଉଇକିପିଡ଼ିଆ ରୁ
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1 ମାଇକ୍ରୋମିଟର =
SI units
1.0000×10^−6 m ୧�00000 μm
US customary / Imperial units
3.2808×10^−6 ft 39.370×10^−6 in

The micrometre (International spelling as used by the International Bureau of Weights and Measures;[୧] SI symbol: µm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling 1×10−6 of a metre (SI standard prefix "micro-" = 10−6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).[୧] 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 micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria and is also commonly used in plastics manufacturing.[୧] Micrometres are the standard for grading wool (referring to the diameter of wool fibres). Any wool finer than 25 µm can be used for garments, while coarser grades are used for outerwear, rugs and carpets.[୨] A human hair is about 90 µm wide.


  1. ୧.୦ ୧.୧ ୧.୨ "micrometre". Encyclopedia Britannica Online. Retrieved 18 May 2014.
  2. "Wool Fibre". "NSW Department of Education and Communities". Retrieved 18 May 2014.