Definitions for angstrom unit
angstrom unit

Princeton's WordNetRate this definition:0.0 / 0 votes

1. angstrom, angstrom unit, Anoun

   a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

WikipediaRate this definition:0.0 / 0 votes

1. angstrom unit

   The angstrom (, ; ANG-strəm, ANG-strum) or ångström is a metric unit of length equal to 10−10 m; that is, one ten-billionth (US) of a metre, a hundred-millionth of a centimetre, 0.1 nanometre, or 100 picometres. Its symbol is Å, a letter of the Swedish alphabet. The unit is named after the Swedish physicist Anders Jonas Ångström (1814–1874).The angstrom is often used in the natural sciences and technology to express sizes of atoms, molecules, microscopic biological structures, and lengths of chemical bonds, arrangement of atoms in crystals, wavelengths of electromagnetic radiation, and dimensions of integrated circuit parts. The atomic (covalent) radii of phosphorus, sulfur, and chlorine are about 1 angstrom, while that of hydrogen is about 0.5 angstroms. Visible light has wavelengths in the range of 4000–7000 Å. In the late 19th century, spectroscopists adopted 10−10 of a metre as a convenient unit to express the wavelengths of characteristic spectral lines (monochromatic components of the emission spectrum) of chemical elements. However, they soon realized that the definition of the metre at the time, based on a material artifact, was not accurate enough for their work. So, around 1907 they defined their own unit of length, which they called "Ångström", based on the wavelength of a specific spectral line. It was only in 1960, when the metre was redefined in the same way, that the angstrom became again equal to 10−10 metre. Even though it is a decimal power fraction of the metre, the angstrom was never part of the SI system of units, and it has been increasingly replaced by the nanometre or picometre. Up to 2019, it was listed as a compatible unit by both the International Bureau of Weights and Measures (BIPM) and the US National Institute of Standards and Technology (NIST), but it is not mentioned in the 9th edition of the official SI document, the "BIPM Brochure" (2019) or in the NIST version of the same.The 8th edition of the BIPM brochure (2006) and the NIST guide 811 (2008) used the spelling ångström, with Swedish letters; however, this form is rare in English texts. Some popular US dictionaries list only the spelling angstrom.The accepted symbol is "Å", no matter how the unit is spelled. However, "A" is often used in less formal contexts or typographically limited media.

ChatGPTRate this definition:0.0 / 0 votes

1. angstrom unit

   The angstrom unit is a unit of length that is primarily used in the field of physics, chemistry, and biology to measure atomic radii, molecular structures, and wavelengths of electromagnetic radiation. It is symbolized by the letter Å and one angstrom is equivalent to 10^-10 meters or 0.1 nanometers. It is named after the Swedish physicists Anders Jonas Ångström.

Matched Categories

1. • Metric Linear Unit

How to pronounce angstrom unit?

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Numerology

1. Chaldean Numerology

   The numerical value of angstrom unit in Chaldean Numerology is: 9

2. Pythagorean Numerology

   The numerical value of angstrom unit in Pythagorean Numerology is: 9

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=angstrom unit
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Angstrom_Unit
3. ^ ChatGPT
   https://chat.openai.com