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From Wikipedia, the free encyclopedia

1 nanometre =
SI units
1×10−9 m 1×10−3 μm
US customary / Imperial units
3.281×10^−9 ft 39.37×10^−9 in

A nanometre (American spelling: nanometer; symbol nm) (Greek: νάνος, nanos, "dwarf"; μέτρον, metrοn, "unit of measurement") is a unit of length in the metric system, equal to one billionth of a meter.

It is one of the more often used units for very small lengths, and equals ten Ångström, an internationally recognized non-SI unit of length. It is often associated with the field of nanotechnology and the wavelength of light. Formerly, millimicron (symbol ) was used for the nanometre. The symbol µµ has also been used [1][2][3].

It is also the most common unit used to describe the manufacturing technology used in the semiconductor industry. It is the most common unit to describe the wavelength of light, with visible light falling in the region of 400–700 nm.


  1. ^ THE SVEDBERG and J. BURTON NICHOLS; “Determination of the size and distribution of size of particle by centrifugal methods”; Journal of the American Chemical Society; American Chemical Society, Washington, D.C.; December 1923; 45 (12): pp. 2910–2917.
  2. ^ THE SVEDBERG and HERMAN RINDE; “The ulta-centrifuge, a new instrument for the determination of size and distribution of size of particle in amicroscopic colloids”; Journal of the American Chemical Society; American Chemical Society, Washington, D.C.; December 1924; 46 (12): pp. 2677–2693.
  3. ^ KARL TERZAGHI; Erdbaumechanik auf bodenphysikalischer Grundlage; Franz Deuticke, Vienna, Austria / Leipzig, Germany; 1925 [Unaltered reproduction by G. Gistel & Cie., Vienna; 1976]; 399 pp. (page 32)

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Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also nanometer



Nanometer m.

  1. nanometre (unit of measure)


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