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Anders Jonas Ångström

 
Britannica Concise Encyclopedia: Anders Jonas Ångström
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(born Aug. 13, 1814, Lögdö, Swed. — died June 21, 1874, Uppsala) Swedish physicist. From 1839 he taught at the University of Uppsala. He devised a method of measuring thermal conductivity, showing it to be proportional to electrical conductivity, and deduced that an incandescent gas emits rays of the same refrangibility as those it can absorb. A founder of spectroscopy, he discovered that hydrogen is present in the Sun's atmosphere, published a map of the normal solar spectrum, and was the first to examine the spectrum of the aurora borealis and to detect and measure the characteristic bright line in its yellow-green region. The angstrom (10-10 m), a unit of length, was named in his honour.

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Columbia Encyclopedia: Anders Jöns Ångström
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Ångström, Anders Jöns (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.
Dictionary: Ång·ström   (ăng'strəm, ông'strœm) pronunciation
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, Anders Jonas 1814-1874.

Swedish physicist and astronomer who founded the science of spectroscopy and discovered by studying the solar spectrum that there is hydrogen in the sun's atmosphere.


 
 

 

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Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.  Read more
Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more