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angstrom[ang´strum] Pronunciation Key, abbr. a, unit of length equal to 10-10 meter (0.0000000001 meter); it is used to measure the wavelengths of visible light and of other forms of electromagnetic radiation, such as ultraviolet radiation and X rays. Scientists now prefer to use the nanometer (nm); 1 nm=10 a. The angstrom is named in honor of Swedish physicist Anders J. angstrOm.
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