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Jean Baptiste André Dumas (French pronunciation: [ʒɑ̃ batist ɑ̃dʁe dyma]; 14 July 1800 – 10 April 1884) was a French chemist, best known for his works on organic analysis and synthesis, as well as the determination of atomic weights (relative atomic masses) and molecular weights by measuring vapor densities.
Jean-Baptiste Dumas used the terms "physical atoms" and "chemical atoms"; a "physical atom" was a particle that cannot be divided by physical means such as temperature and pressure, and a "chemical atom" was a particle that could not be divided by chemical reactions. [27]
The Dumas method of molecular weight determination was historically a procedure used to determine the molecular weight of an unknown volatile substance. [ 1 ] [ 2 ] The method was designed by the French chemist Jean Baptiste André Dumas , after whom the procedure is now named.
In 1826, building on the work of Avogadro, the French chemist Jean-Baptiste Dumas states: Gases in similar circumstances are composed of molecules or atoms placed at the same distance, which is the same as saying that they contain the same number in the same volume.
Jean-Baptiste Dumas "For his late valuable researches in organic chemistry, particularly those contained in a series of memoirs on chemical types and the doctrine of substitution, and also for his elaborate investigations of the atomic weights of carbon, oxygen, hydrogen, nitrogen and other elements" — 1844: Carlo Matteucci
The Royal Society of Chemistry (RSC) owns a number of significant artworks in its venue at Burlington House in London. The collection is composed of busts, paintings and other artefacts that were mainly acquired between the mid-19th and early 21st centuries (the Chemical Society was founded in 1841 and merged with others to become the RSC in 1980).
He devised a systematic nomenclature for organic chemistry based on structural grouping of atoms within molecules to determine how the molecules combine in organic reactions. He studied under Jean-Baptiste Dumas as a laboratory assistant and worked with Charles Frédéric Gerhardt. He died in Paris from tuberculosis.
Jean-Baptiste Dumas (1800–1884) – chemist who established new values for the atomic mass of thirty elements; André Dumont (1809–1857) – Belgian geologist who prepared the first geological map of Belgium and named many of the subdivisions of the Cretaceous and Tertiary [25]