Named after the Swedish physicist A J Ångström (1814-74). It is an old unit used for measuring the wavelength of electromagnetic radiation including visible light and X-rays. The unit has since been superseded by the nanometre but is still used in crystallography.
1Å = 10-10m

Atomic diameters range between 1 and 2 Angstroms.

See also: Angstrom Anders, Jon, Angstrom Star, Fermi, Micron, Nanometre.

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Subjects: Chemistry Optics Physics