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ANGSTROM UNIT [1 record]

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Record 1 2023-05-16

English

Subject field(s)
  • Metrology and Units of Measure
  • Atomic Physics
  • Chemistry
Universal entry(ies)
Å
symbol
DEF

A unit of linear measurement in the centimeter-gram-second system equivalent to 10-10 metre, i.e. 1/10 000 000 000 metre.

OBS

Named in honour of Swedish physicist Anders J. Angström (1814 -1874). ... It equals 10-10 metre, 10-8 centimetre, 10-4 micron, or 10-1 millimicron. Such ultramicroscopic distances as the dimensions of atoms, molecules, unit cells and short wavelengths are expressed in angstroms.

OBS

As a unit, the initial letter of angstrom is sometimes capitalized.

OBS

The closest "equivalent" SI unit is the nanometre (1 nm = 10 Å). (SI: International System of Units).

OBS

AU; A.U.: These abbreviations could be confused with the symbols for "astronomical unit" and the chemical element "gold."

French

Domaine(s)
  • Unités de mesure et métrologie
  • Physique atomique
  • Chimie
Entrée(s) universelle(s)
Å
symbol
DEF

Unité de longueur employée en microphysique, valant un dix-millième de micron.

CONT

Des études récentes [...] ont montré que dans les verres volcaniques où les cristaux sont pourtant absents, l'altération progresse d'une façon analogue, entre des particules sphériques de quelques centaines à quelques milliers d'angströms.

OBS

Unité de longueur mesurant 10-8 cm.

OBS

Cette unité ne fait pas partie du Système international d'unités (SI). Les unités reconnues par le SI, qui peuvent être utilisées à la place de l'ångström sont le picomètre (1 Å = 100 pm) et le nanomètre (1 Å = 0,1 nm). Il semblerait que le picomètre remplace l'ångström pour mesurer les longueurs des liaisons chimiques.

Key term(s)
  • aangström

Spanish

Campo(s) temático(s)
  • Metrología y unidades de medida
  • Física atómica
  • Química
Entrada(s) universal(es)
Å
symbol
DEF

Medida de longitud que equivale a una diezmillonésima de milímetro.

CONT

El tamaño de un virus varía de 100 a 2000 angströms, por lo que únicamente se pueden observar con la ayuda de un microscopio electrónico.

OBS

Sirve para medir la longitud de onda de las radiaciones luminosas así como las dimensiones atómicas.

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