Is it farther or further?
unit of length equal to one hundred millionth of a centimeter (used to measure wavelengths of light), 1892, named for Swedish physicist Anders Ångström (1814-1874).
angstrom ang·strom or ång·strom (āng'strəm)
Abbr. A, Å, angst
A unit of length equal to one hundred millionth (10-8) of a centimeter, used especially to specify radiation wavelengths.
unit of length used chiefly in measuring wavelengths of light, equal to 1010 metre, or 0.1 nanometer. It is named for the 19th-century Swedish physicist Anders Jonas Angstrom. The angstrom and multiples of it, the micron (104 A) and the millimicron (10 A), are also used to measure such quantities as molecular diameters and the thickness of films on liquids