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From Wikipedia, the free encyclopedia

1 micrometre =
SI units
1.000×10^−6 m 1.0000 μm
US customary / Imperial units
3.281×10^−6 ft 39.37×10^−6 in

A micrometre or micron (American spelling:[1] micrometer; symbol µm) is one millionth of a metre, or equivalently one thousandth of a millimetre or one thousand nanometres. It can also be written in scientific notation as 1×10−6 m, meaning 11000000 m.

A strand of human hair is about 100 µm wide.[2] Red blood cells are approx. 8 µm in diameter.[2]

The micrometre is a common unit of measurement for wavelengths of infrared radiation. The name micron and the solitary symbol µ (both of which were official between 1879 and 1967 [3]) are still used (especially in astronomy and in the semiconductor industry) to denote a micrometre.

See also


  1. ^ NOTE: The American spelling of "micrometer" is rarely used (micron is typically used instead), due to the existence of a measuring device of the same name.
  2. ^ a b DNA From The Beginning, section 6: Genes are real things., "Amination" section, final slide
  3. ^ BIPM - Resolution 7 of the 13th CGPM (1967/68), "Abrogation of earlier decisions (micron, new candle)".

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