Germain Henri Hess
Germain Henri Hess ( born August 7, 1802 in Geneva, † 30 Novemberjul / December 12 1850greg in Saint Petersburg.. ) Was a Swiss- Russian chemist and mineralogist.
Life
Hermann Heinrich Hess was born on August 7, 1802 in Geneva, the son of a Swiss painter. With three years of Hess and his family moved to Russia in the near Moscow, where he lived on an estate. At the age of 15 years, Hess went to the Gymnasium in Tartu, Estonia. Two years later, in 1822, he got there, the conclusion must have been passed matriculation examination in the same year and began his studies at the University of Dorpat. Three years later he received his doctorate.
Due to the great abilities which showed Hess, he was able to work for several months at the University of Stockholm with one of the most famous chemists ( Jöns Jakob Berzelius ). After studying in Stockholm Hess returned to Russia. In the city of Irkutsk ( Siberia), he took the job as a doctor specializing in obstetrics and rare eye diseases. He remained, however, during this time also his preference for mineralogy and chemistry loyal, made several research trips to the Urals and Lake Baikal and examined and described the minerals found there, salt deposits and mineral waters.
End of 1828 Hess was elected as an assistant in the chemistry of the St. Petersburg Academy of Sciences. He then announced in early 1829 on his doctor's office and moved to St. Petersburg to receive there his work at the Academy. During this time, Hess carried out a two-volume textbook, which he titled with "Fundamentals of pure chemistry ." It was considered for many years as a Russian standard work of chemistry teaching. Only four years later became a full member of the Academy.
In the 1830s, Hess dealt increasingly with the amount of heat that often occur in chemical reactions. He also examined various organic substances such as sugar. The late thirties, he devoted himself completely but the analysis of evolution of heat in chemical reactions. His results published Hess 1840 at the St. Petersburg University. In these works Hess formulated the today known as Hess'scher heat set set, " that in various chemical conversions of a substance A with another substance B the exchanged amounts of heat are respectively constant and independent of the ways in which the corresponding reactions were carried out. ".
Honors
The mineral hessite is named after him.