For the measuring instrument, see Micrometer (device).
"Micron" redirects here. For other uses, see Micron (disambiguation).
"Microscale" redirects here. For other uses, see Microscale (disambiguation).
"μm" redirects here. For the chemical unit "μM", see Micromolar.
micrometre
A 6 μm diameter carbon filament above a 50 μm diameter human hair
General information
Unit system
SI
Unit of
length
Symbol
μm
Conversions
1 μm in ...
... is equal to ...
SI base units
10−6 m
Natural units
1.8897×104a0
imperial/US units
3.9370×10−5 in
The micrometre (Commonwealth English) as used by the International Bureau of Weights and Measures;[1] SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron,[2] is a unit of length in the International System of Units (SI) equalling 1×10−6 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 0.00004 inch).[1]
The nearest smaller common SI unit is the nanometre, equivalent to one thousandth of a micrometre, one millionth of a millimetre or one billionth of a metre (0.000000001 m).
The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria,[1] and for grading wool by the diameter of the fibres.[3] The width of a single human hair ranges from approximately 20 to 200 μm.
^ abc"micrometre". Encyclopædia Britannica Online. Retrieved 18 May 2014.
^"Writing with SI (Metric System) Units". NIST. 13 January 2010.
^"Wool Fibre". NSW Department of Education and Communities. Archived from the original (Word Document download) on 17 June 2016. Retrieved 18 May 2014.
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(device), used for accurate measurements by means of a calibrated screw Micrometre, a millionth of a metre This disambiguation page lists articles associated...
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diameter balloon constructed from a 9-micrometre (0.00035 in) thick mylar film sandwiched between two layers of 4.5-micrometre (0.00018 in) thick aluminium foil...
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small as a few hundred nanometres, but are typically a few micrometres to hundreds of micrometres in diameter. Iron, manganese, and chromium secondary phases...
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Global Information