Johan Gottlieb Gahn
Encyclopedia
Johan Gottlieb Gahn was a Swedish
Sweden
Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 chemist
Chemist
A chemist is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties such as density and acidity. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms...

 and metallurgist who discovered manganese
Manganese
Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals...

 in 1774.

Gahn studied in Uppsala
Uppsala
- Economy :Today Uppsala is well established in medical research and recognized for its leading position in biotechnology.*Abbott Medical Optics *GE Healthcare*Pfizer *Phadia, an offshoot of Pharmacia*Fresenius*Q-Med...

 1762-1770 and became acquainted with chemists Torbern Bergman
Torbern Bergman
Torbern Olof Bergman was a Swedish chemist and mineralogist noted for his 1775 Dissertation on Elective Attractions, containing the largest chemical affinity tables ever published...

 och Carl Wilhelm Scheele
Carl Wilhelm Scheele
Carl Wilhelm Scheele was a German-Swedish pharmaceutical chemist. Isaac Asimov called him "hard-luck Scheele" because he made a number of chemical discoveries before others who are generally given the credit...

. 1770 he settled in Falun
Falun
Falun is a city and the seat of Falun Municipality in Dalarna County, Sweden, with 36,447 inhabitants in 2005. It is also the capital of Dalarna County...

, where he introduced improvements in copper smelting
Smelting
Smelting is a form of extractive metallurgy; its main use is to produce a metal from its ore. This includes iron extraction from iron ore, and copper extraction and other base metals from their ores...

, and participated in building up several factories, including those for vitriol, sulfur
Sulfur
Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...

 and red paint
Falu red
Falu red or Falun red is the name of a Swedish, deep red paint well known for its use on wooden cottages and barns. The paint originated from the copper mine at Falun in Dalarna, Sweden. The traditional colour remains popular today due to its effectiveness in preserving wood. In Finland, it is...

.

He was the chemist for The Swedish Board of Mines Bergskollegium
Swedish Board of Mines
The Swedish Board of Mines was a Swedish government agency that worked between 1637–1857 with the task of guiding and controlling the mining industry and metal processing in Sweden. Between 1637–1649 its name was Generalbergsamtet, also called Bergsämbetet....

from 1773-1817. Gahn was however very reluctant to publish his scientific findings himself, but freely communicated them to Bergman and Scheele. One of Gahn's discoveries was that manganese dioxide could be reduced to manganese metal using carbon
Carbon
Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds...

, becoming the first to isolate this element in its metal form.

In 1784, Gahn was elected a member of the Royal Swedish Academy of Sciences
Royal Swedish Academy of Sciences
The Royal Swedish Academy of Sciences or Kungliga Vetenskapsakademien is one of the Royal Academies of Sweden. The Academy is an independent, non-governmental scientific organization which acts to promote the sciences, primarily the natural sciences and mathematics.The Academy was founded on 2...

. He also made a managerial career in Swedish mining.

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