Knut Ångström

Knut Ångström Johann (* January 12, 1857, † March 4, 1910 ) was a Swedish physicist.

The son of Anders Jonas Ångström studied from 1877 to 1884 at the University of Uppsala. After his licentiate he went briefly to the University of Strasbourg with August Kundt. Back in Uppsala, he earned his Ph.D., and in 1885 professor of physics at the new university in Stockholm, where he planned and built the Physics department. In 1890 he was elected a member of the Scholars Academy Leopoldina. In 1891 he returned to Uppsala and in 1896 professor of physics.

He examined the radiant heat of the sun and absorbing the atmosphere. In 1893 he invented his electrically compensated pyrheliometer.

Publications

• The expansion of the water by the absorption of gases. 1882 ( online)
• Via the diffusion of radiant heat from flat surfaces. 1885 (online)
• The volume and density changes in fluids by absorption of gases. 1888 ( online)
• Observations on the radiation of heat through different wavelength through turbid media. 1889 (online)
• Some remarks on the occasion of the bolometric work of Fr Paschen. 1894 (online)
• About absolute determinations of thermal radiation with the electric Compensationspyrheliometer together with some examples of the application of this instrument. 1899 (online)
• Some observations on the absorption of terrestrial radiation by the atmospheric carbon dioxide. 1901
• The ozone bands of the solar spectrum and the importance thereof. For the broadcasting of the Earth 1904
• Some sentences concerning the fundamental absorption and the absorption spectra of gases: a preliminary communication. 1908