angstrom
American Heritage Dictionary:
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ang·strom
or ång·strom (ăng'strəm) 
n. (Abbr. A or Å or angst)
A unit of length equal to one hundred-millionth (10 -8) of a centimeter, used especially to specify radiation wavelengths. Also called angstrom unit.
n. (Abbr. A or Å or angst)
A unit of length equal to one hundred-millionth (10 -8) of a centimeter, used especially to specify radiation wavelengths. Also called angstrom unit.
[After Anders Jonas ÅNGSTRÖM.]
Oxford Dictionary of Chemistry:
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angstrom
Symbol Å. A unit of length equal to 10−10 metre. It was formerly used to measure wavelengths and intermolecular distances but has now been replaced by the nanometre. 1 Å=0.1 nanometre. The unit is named after A. J. Ångström.
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[Etymology: A. J. Ångström; Sweden 1814-74] physics. Symbol Å. The length 10-10 m = 0.1 nm, though expressed as 1.000 000 2~ × 10-10 prior to the minor re-sizing of the metre in 1960.
History
Originally (in 1868 for solar radiations) and still used for expression of wavelengths in the electromagnetic spectrum. After elaborate measurement of the wavelength of the red line of cadmium at 6438.4696 × 1010 m, it was agreed internationally in 1907 that the angstrom be defined by assigning the value 6438.4696 Å to that wavelength
[Barrell H. Proc. Roy. Soc. London Ser. A Vol. 186, 164-70 (1946)] (in dry air containing 0.03% carbon dioxide, at standard atmospheric pressure and a temperature of 15°C). This was the pioneer use of light to define length, presaging the application to the metre in 1960, using krypton. By that time the 1907 definition had been shown to have made the angstrom 1.000 000 2~ × 10-10 m relative to the extant prototype metre; the 1960 re-definition changed the length of the metre to make it precisely 1010 Å as defined in 1907.
The 1978 decision of the CIPM considering it acceptable to continue to use the angstrom with the SI still stands.
See also angström star; tenth metre.
Computer Desktop Encyclopedia:
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angstrom
A unit of measurement equal to .1 nanometer, which is approximately 1/250 millionth of an inch. Angstroms are used to measure the wavelengths of light and the elements in a chip. One nanometer is equal to 10 angstroms, and one micron is equal to 10,000 angstroms. The size of an atom is three to 10 angstroms.
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A unit of length; used to express electromagnetic wavelengths; 1 Å = 10-10 meter = 1/10 nanometer. Abbr. Å.
Columbia Encyclopedia:
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angstrom
angstrom (ăng'strəm), abbr. Å, unit of length equal to 10−10 meter (0.0000000001 meter); it is used to measure the wavelengths of visible light and of other forms of electromagnetic radiation, such as ultraviolet radiation and X rays. Scientists now prefer to use the nanometer (nm); 1 nm=10 Å. The angstrom is named in honor of Swedish physicist Anders J. Ångström.
Word Tutor:
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angstroms
IN BRIEF: A unit used to express the length of light waves; one tenth of a millimicron.
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Oxford Dictionary of Biochemistry:
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ångström
or Ångstrom
symbol: Å; a unit of length equal to 10−10 metres. It is used in atomic measurements and for wavelengths of electromagnetic radiation, and is temporarily approved for use with SI units. [After Anders Jonas Ångström (1814 — 74), Swedish physicist noted for his work on spectroscopy.]
symbol: Å; a unit of length equal to 10−10 metres. It is used in atomic measurements and for wavelengths of electromagnetic radiation, and is temporarily approved for use with SI units. [After Anders Jonas Ångström (1814 — 74), Swedish physicist noted for his work on spectroscopy.]
| Å, a′, azurophil | |
| −H, α+β protein, α-1,3-mannosyl-glycoprotein β-1,2-N-acetylglucosaminyltransferase |
Saunders Veterinary Dictionary:
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angstrom
A nonsystematic unit of length equal to 10−10 meter or 0.1 nanometer; symbol Å.
Random House Word Menu:
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categories related to 'angstrom'
- Electricity and Magnetism - angstrom: unit of linear measure used to express wavelengths of optical spectra, equal to 10-10 meter
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Oxford Dictionary of Chemistry
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A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.
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