Definition of angstrom in English:


(also ångström, angstrom unit, Å)


  • A unit of length equal to one hundred-millionth of a centimeter, 10–¹⁰ meter, used mainly to express wavelengths and interatomic distances.

    • ‘While I'm thinking about it, did you know that last year an electron microscope was developed with a ‘resolution’ of 1 angstrom?’
    • ‘The crystals, which resemble spheres just 50 angstroms wide, are engineered to hold and prevent lateral movement of a charge to other isolated nanocrystals.’
    • ‘An angstrom, the smallest wavelength of light, is about 500,000 times smaller than the thickness of a human hair.’
    • ‘The gramicidin channel consists of a head-to-head dimer of beta 6.5 helices in which the 4 - angstrom pore is lined by the neutrally terminated peptide backbone.’
    • ‘Some physicists like to use angstroms for wavelengths, while others use the strict metric system, so you will also find wavelengths given in nanometers.’
    • ‘The rate of crack propagation in stage I is generally very low, on the order of angstroms per cycle, compared with crack propagation rates of microns per cycle for stage II.’
    • ‘Lipid molecules in large membranes are believed to assemble and move collectively as aggregates (so called ‘rafts’), which can span several hundred angstroms of the bilayer surface.’
    • ‘In the absence of a polymer cushion, the aqueous film thickness was found to vary between a few angstroms and more than 4 nm.’
    • ‘An angstrom is a unit of length equal to one ten billionth of a meter.’
    • ‘The wavelength of radiation is sometimes given in units with which we are familiar, such as inches or centimeters, but for very small wavelengths, they are often given in angstroms.’
    • ‘Photonic crystal technology can create color screen displays 1,000 angstroms thick ideal for cell phones or new generation palm pilots.’
    • ‘Dissecting out these small motions from thermal noise, already of amplitude a few angstroms, remains a challenge in simulation analysis.’
    • ‘An angstrom, a unit of length measuring the wavelength of light, is about 500,000 times smaller than the thickness of a human hair.’
    • ‘The Mg 2 + cations were initially positioned several angstroms from the solute.’
    • ‘Coatings that were once measured in microns are now measured in angstroms.’
    • ‘If one could stretch it out, a single DNA molecule can be more than a meter long (although only a few hundred angstroms wide)!’
    • ‘We've been able to achieve a resolution of three angstroms - the width of three hydrogen atoms - in our measurements of the progress of this enzyme along DNA.’
    • ‘An angstrom is an atomic scale unit of measure of one ten - billionth of a meter, approximately equaling the diameter of an atom.’
    • ‘The strength of the interactions involving the N-terminal residues increases between 2 and 4 ns, with an average decrease in the interside-chain distance of about an angstrom in all cases.’
    • ‘Since an angstrom is a tenth of a millionth of a metre, that's pretty small.’


Late 19th century: named after A. J. Ångström(see Ångström, Anders Jonas).