angstrom unit
/'ɔɳstrə/
Học thuậtThân thiện
Definition
- 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
- a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation