Nanometre


Nanometre
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 nanometer (British spelling: nanometre; symbol nm) is a unit of length in the metric system, equal to one billionth of a metre. The name combines the SI prefix nano- (from the Ancient Greek νάνος, nanos, "dwarf") with the parent unit name metre (from Greek μέτρον, metrοn, "unit of measurement").

The nanometre is often used to express dimensions on the atomic scale: the diameter of a helium atom, for example, is about 0.1 nm, and that of a ribosome is about 20 nm. The nanometre is commonly used to specify the wavelength of electromagnetic radiation near the visible part of the spectrum: visible light, in particular, ranges from 400 to 700 nm. In these uses, the nanometre appears to be supplanting the other common unit for atomic scale dimensions, the angstrom, which is equal to 0.1 nanometre.

This unit is often associated with the field of nanotechnology. Since late 1980s, it has also been used to describe generations of the manufacturing technology in the semiconductor industry.

The nanometre was formerly known as the millimicron, since it is 1/1000 of a micron (micrometre), and was often denoted by the symbol or (more rarely) µµ.[1][2][3]

One nanometre is one billionth (1/1000000000) of a metre.

References

  1. ^ Svedberg, The; Nichols, J. Burton (1923). "Determination of the size and distribution of size of particle by centrifugal methods". Journal of the American Chemical Society 45 (12): 2910–2917. doi:10.1021/ja01665a016. 
  2. ^ Svedberg, The; Rinde, Herman (1924). "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 46 (12): 2677–2693. doi:10.1021/ja01677a011. 
  3. ^ Terzaghi, Karl (1925). Erdbaumechanik auf bodenphysikalischer Grundlage. Vienna: Franz Deuticke. p. 32. 

External links


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Look at other dictionaries:

  • nanomètre — [ nanɔmɛtr ] n. m. • v. 1961; de nano et mètre ♦ Métrol. Millième partie du micromètre (symb. nm). ● nanomètre nom masculin Unité de mesure de longueur (symbole nm), équivalant à un milliardième de mètre. nanomètre [nanɔmɛtʀ] n. m. ÉTYM. 1961; …   Encyclopédie Universelle

  • Nanometre — Mètre Pour les articles homonymes, voir Mètre (homonymie) …   Wikipédia en Français

  • Nanomètre — Mètre Pour les articles homonymes, voir Mètre (homonymie) …   Wikipédia en Français

  • nanometre — UK [ˈnænəʊˌmiːtə(r)] / US [ˈnænoʊˌmɪtər] noun [countable] Word forms nanometre : singular nanometre plural nanometres a unit for measuring length in the metric system. There are one billion (= one thousand million) nanometres in a millimetre …   English dictionary

  • nanometre — nanometras statusas T sritis Standartizacija ir metrologija apibrėžtis Dalinis ilgio matavimo vienetas, 10⁹ karto mažesnis už metrą: 1 nm = 10⁻⁹ m. atitikmenys: angl. nanometer; nanometre vok. Nanometer, n rus. нанометр, m pranc. nanomètre, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • nanomètre — nanometras statusas T sritis Standartizacija ir metrologija apibrėžtis Dalinis ilgio matavimo vienetas, 10⁹ karto mažesnis už metrą: 1 nm = 10⁻⁹ m. atitikmenys: angl. nanometer; nanometre vok. Nanometer, n rus. нанометр, m pranc. nanomètre, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • nanometre — nanometras statusas T sritis fizika atitikmenys: angl. nanometer; nanometre vok. Nanometer, n rus. нанометр, m pranc. nanomètre, m …   Fizikos terminų žodynas

  • nanomètre — nanometras statusas T sritis fizika atitikmenys: angl. nanometer; nanometre vok. Nanometer, n rus. нанометр, m pranc. nanomètre, m …   Fizikos terminų žodynas

  • nanometre — n. one thousand millionth of a metre (10 9 m). One nanometre is equal to 10 angstrom. Symbol: nm …   Medical dictionary

  • nanometre — n. one thousand millionth of a metre (10 9 m). One nanometre is equal to 10 angstrom. Symbol: nm …   The new mediacal dictionary


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