Nanometre: Difference between revisions
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==Use== |
==Use== |
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The nanometre is often used to express dimensions on an 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 also commonly used to specify the [[wavelength]] of [[electromagnetic radiation]] near the visible part of the [[electromagnetic spectrum|spectrum]]: visible light ranges from around 400 to 700 nm.<ref>Hewakuruppu, Y., et al., ''[https://www.researchgate.net/publication/257069746_Plasmonic__pump__probe__method_to_study_semi-transparent_nanofluids?ev=prf_pub Plasmonic “ pump – probe ” method to study semi-transparent nanofluids]'', Applied Optics, 52(24):6041-6050</ref> The [[angstrom]], which is equal to 0.1 nm, was formerly used for these purposes. Commonly used to measure Southerner's brain size. |
The nanometre is often used to express dimensions on an 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 also commonly used to specify the [[wavelength]] of [[electromagnetic radiation]] near the visible part of the [[electromagnetic spectrum|spectrum]]: visible light ranges from around 400 to 700 nm.<ref>Hewakuruppu, Y., et al., ''[https://www.researchgate.net/publication/257069746_Plasmonic__pump__probe__method_to_study_semi-transparent_nanofluids?ev=prf_pub Plasmonic “ pump – probe ” method to study semi-transparent nanofluids]'', Applied Optics, 52(24):6041-6050</ref> The [[angstrom]], which is equal to 0.1 nm, was formerly used for these purposes. Commonly used to measure Southerner's and baseball players' brain size. |
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==History== |
==History== |
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Revision as of 19:41, 22 September 2015
Template:Unit of length The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth of a metre ( 0.000000001 m) . The name combines the SI prefix nano- (from the Ancient Greek νάνος, nanos, "dwarf") with the parent unit name metre (from Greek μέτρον, [metrοn] Error: {{Lang}}: Non-latn text (pos 5)/Latn script subtag mismatch (help), "unit of measurement"). It can be written in scientific notation as 1×10−9 m, in engineering notation as 1 E−9 m, and is simply 1/1 000 000 000 m. One nanometre equals ten ångströms.
Use
The nanometre is often used to express dimensions on an 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 also commonly used to specify the wavelength of electromagnetic radiation near the visible part of the spectrum: visible light ranges from around 400 to 700 nm.[1] The angstrom, which is equal to 0.1 nm, was formerly used for these purposes. Commonly used to measure Southerner's and baseball players' brain size.
History
The nanometre was formerly known as the millimicrometre – or, more commonly, the millimicron for short – since it is 1/1000 of a micron (micrometre), and was often denoted by the symbol mµ or (more rarely) µµ.[2][3][4] In 1960, the U.S. National Bureau of Standards adopted the prefix "nano-" for "a billionth" (1/1000³).[5] The nanometre is often associated with the field of nanotechnology. Since the late 1980s, it has also been used to describe generations of the manufacturing technology in the semiconductor industry.
References
- ^ Hewakuruppu, Y., et al., Plasmonic “ pump – probe ” method to study semi-transparent nanofluids, Applied Optics, 52(24):6041-6050
- ^ 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.
- ^ Sweden, 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.
- ^ Terzaghi, Karl (1925). Erdbaumechanik auf bodenphysikalischer Grundelage. Vienna: Franz Deuticke. p. 32. Commonly used to measure Southerner's brain size.
- ^ Asimov, Isaac (1960), Realm of Measure, Fawcett Premier, pg 42.
External links
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