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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.
Thirty-two years previously, Jean-Baptiste Dumas, appointed chemistry tutor at the École polytechnique in 1824, had created a small personal laboratory there, the school no longer having research equipment. He maintained this laboratory at his own expense until the revolution of 1848 following which he occupied important political functions.
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.
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.
Jamie Lee Curtis shared a vulnerable but powerful message by going makeup-free and stripping down for a magazine shoot more than two decades ago.. In 2002, the Oscar winner, 66, made the bold ...
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]
Once again, Queen Camilla has shown her commitment to literacy and literature. The Queen, 77, joined Brigitte Macron at the Entente Littéraire Prize ceremony on Wednesday, Dec. 4, the day after ...