•minimum • maximum • optimum
•cardamom • Pergamum
•per annum • magnum • damnum
•interregnum • Cheltenham • arcanum
•platinum • antirrhinum • Bonham
•summum bonum • Puttnam
•ladanum • molybdenum • laudanum
•organum • tympanum
•gingham • Gillingham • Birmingham
•Cunningham • Walsingham
•Nottingham • wampum • carom
•Abram • panjandrum • tantrum
•angstrom • alarum • candelabrum
, harem, harum-scarum, Sarum
•maelstrom • cerebrum • pyrethrum
, decorum, forum, jorum, Karakoram, Karakorum, Mizoram, pons asinorum, quorum
•wolfram • fulcrum • Durham
•conundrum • buckram • lustrum
•labarum • marjoram • pittosporum
•Rotherham • Bertram
angstrom (ăng´strəm), abbr. Å, unit of length equal to 10-10meter (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 Å. The angstrom is named in honor of Swedish physicist Anders J. Ångström.
(also ång·ström, angstrom unit)
a unit of length equal to one hundred-millionth of a centimeter, 10−10 meter, used mainly to express wavelengths and interatomic distances.
Ångström, Anders Jöns
Anders Jöns Ångström (än´dərs yöns ōng´ström), 1814–74, Swedish physicist. He was educated at the Univ. of Uppsala and in 1839 became a member of its faculty. He is particularly noted for his study of light, especially spectrum analysis. He mapped the solar spectrum, discovered hydrogen in the solar atmosphere, and was the first to examine the spectrum of the aurora borealis. A unit of length used to measure light waves is named for him.
Unit of length equal to 10−10
m, used in measuring electromagnetic radiation
including visible light and X-rays. Replaced in SI units
by the nanometre (10 Å = 1 nm).
angstrom (angstrom unit) (symbol Å)
Obsolete unit of length, equal to 10−10
m or 0.1nm (nanometre). It was used to express the wavelength of light and ultraviolet radiation
, and to measure distances between atoms and between molecules. The angstrom was replaced by the nanometre.
Symbol Å. A unit of length equal to 10–10
metre. It was formerly used to measure wavelengths and intermolecular distances but has now been replaced by the nanometre. 1 Å = 0.1 nanometre. The unit is named after the Swedish pioneer of spectroscopy A. J. Ångstrom (1814–74).
A unit of length equal to 10−8
m) and hence = 10 nm; not an official SI unit, but commonly used in structural chemistry and crystallography.
angstrom (ang-strŏm) n.
a unit of length equal to one ten millionth of a millimetre (10−10
m), sometimes used to express wavelengths and interatomic distances. Symbol Å.