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Robert Wilhelm Eberhard Bunsen (German:; 30 March 1811 [a] – 16 August 1899) was a German chemist. He investigated emission spectra of heated elements, and discovered caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. [11] The Bunsen–Kirchhoff Award for spectroscopy is named after Bunsen and Kirchhoff.
Spectroscope of Kirchhoff and Bunsen. The systematic attribution of spectra to chemical elements began in the 1860s with the work of German physicists Robert Bunsen and Gustav Kirchhoff, [30] who found that Fraunhofer lines correspond to emission spectral lines observed in laboratory light sources. This laid way for spectrochemical analysis in ...
This category is for historic maps showing all or part of Europe. See subcategories for smaller areas. "Historic maps" means maps made over seventy (70) years ago.
Gustav Robert Kirchhoff (German: [ˈgʊs.taf ˈkɪʁçhɔf]; 12 March 1824 – 17 October 1887) was a German physicist, chemist and mathematican who contributed to the fundamental understanding of electrical circuits, spectroscopy and the emission of black-body radiation by heated objects.
Throughout the world there are many cities that were once national capitals but no longer have that status because the country ceased to exist, the capital was moved, or the capital city was renamed. This is a list of such cities, sorted by country and then by date. Where a city name has changed, the name of the city when it was a capital is ...
This is a list of national capitals, including capitals of territories and dependencies, non-sovereign states including associated states and entities whose sovereignty is disputed. The capitals included on this list are those associated with states or territories listed by the international standard ISO 3166-1 , or that are included in the ...
In the late 1850s, Anastasios eventually participated in the lab experiments of Bunsen and Kirchhoff. He also worked in the chemical industry assisting factories in Moscow and Frankfort. [8] [9] Heliocentrism was on the list of forbidden books until 1758. It was not acceptable as a physical fact until the middle to late part of the 19th century.
This is a list of lists of cities in Europe. Lists of countries includes countries that fall to at least some extent within European geographical boundaries according ...