ångström

Also known as angstrom

The angstrom (; ) is a unit of length equal to m; that is, one ten-billionth of a metre, a hundred-millionth of a centimetre, 0.1 nanometre, or 100 picometres. The unit is named after the Swedish physicist Anders Jonas Ångström (1814–1874). It was originally spelled with Swedish letters, as Ångström and later as ångström (). The latter spelling is still listed in some dictionaries, but is now rare in English texts. Some popular US dictionaries list only the spelling angstrom.

AI overview

An ångström is an extremely tiny unit of measurement equal to one ten-billionth of a metre, used to describe the sizes of atoms and the wavelengths of light. The unit was named after Swedish physicist Anders Jonas Ångström and remains useful in physics and chemistry for measuring things too small to see with the naked eye.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Unit.name: angstrom
Unit.image: Hydrogen atom.svg
Unit.caption: The width of a hydrogen atom is about 1.1 angstroms; the width of a proton (in black) is angstroms.
Unit.standard: Non-SI metric unit
Unit.quantity: Length
Unit.symbol: Å
Unit.namedafter: Anders Jonas Ångström
Unit.units1: SI Units
Unit.inunits1: =
Unit.units2: CGS Units
Unit.units3: Imperial units
Unit.units4: Planck units

via Wikipedia infobox

Wikidata facts

Show 7 more facts

Wikidata SPARQL query equivalent: wd:Q81454 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
Commons category: Ångström (unit of length)
conversion to SI unit: 0.0000000001
Unicode character: Å
unit symbol: Å
conversion to standard unit: 1000000000
NCI Thesaurus ID: C71215

Sources (4)

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~7 min read

Article

10 sections

Contents

History
Early connection to the metre
Cadmium line definition
Redefinition in terms of the metre
Angstrom star
Current status
Symbol
See also
References
External links

The unit's symbol is Å, which is a letter of the Swedish alphabet, regardless of how the unit is spelled. However, "A" or "A.U." may be used in less formal contexts or typographically limited media.