Definition

1. Noun:
   • A unit of length: An angstrom unit is a metric unit of length equal to one ten-billionth of a meter (10⁻¹⁰ m) or 0.0001 micron. It is primarily used to specify wavelengths of electromagnetic radiation, such as visible light and X-rays, and to measure atomic-scale distances.

Examples of Usage

• Noun:
  • The wavelength of green light is approximately 5500 angstrom units.
  • In crystallography, atomic spacings are often measured in angstrom units.

Advanced Usage

• Scientific Context: The angstrom unit is a standard unit in physics, chemistry, and materials science for expressing atomic and molecular dimensions.
  • The carbon-carbon bond length in a diamond is about 1.54 angstrom units.

Variants and Related Words

• Ångström: The symbol for the angstrom unit is Å, named after the Swedish physicist Anders Jonas Ångström.
  • The crystal lattice constant was reported as 5.65 Å.
• Angstrom: A common alternative spelling for "ångström" or "angstrom unit."

Synonyms

• Ångström: (Identical in meaning, often used interchangeably)
• Tenth-meter: (A rarely used descriptive synonym, emphasizing it is 10⁻¹⁰ meters)

Related Phrases

• Angstrom scale: Refers to measurements on the order of angstrom units, typical for atoms and molecules.
  • Nanotechnology often involves manipulating materials at the angstrom scale.

Noun

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