Joseph Louis Proust (26 September 1754 – 5 July 1826) was a French chemist. He was best known for his discovery of the law of definite proportions in 1797, stating that chemical compounds always combine in constant proportions.

Joseph-Louis Proust was a French chemist who proved that the relative quantities of any given pure chemical compound’s constituent elements remain invariant, regardless of the compound’s source. This is known as Proust’s law, or the law of definite proportions (1793), and it …

约瑟夫·路易·普鲁斯特（法語： Joseph Louis Proust ，1754年9月26日—1826年7月5日）或譯普勞斯特，法国化学家，其最大贡献是确立了定比定律。

法国分析化学家。 1754年9月26日生于 昂热,1826年7月5日卒于昂热。 1774年在巴黎学习化学。 后迁居西班牙，先后在塞哥维亚、萨拉曼卡等地的一些学校中任教；1789年在马德里任教授。 在马德里期间，西班牙国王查理四世为他装备了非常豪华的皇家实验室，任命他为实验室主任。 因此，他的实验室极适合于做定量分析工作。 1806年普鲁斯特离开西班牙访问巴黎。 1808年法军攻占马德里时，皇家实验室被毁。 1816年被选入巴黎科学院。 普鲁斯特的主要贡献是确立了定比 …

On September 26, 1754, French chemist Joseph Louis Proust was born. He was best known for his discovery of the law of constant composition in 1799, stating that in chemical reactions matter is neither created nor destroyed.

2023年1月30日 · The Law of Constant Composition, discovered by Joseph Proust, is also known as the Law of Definite Proportions. It is different from the Law of Multiple Proportions although both stem from Lavoisier'…

Joseph Louis Proust, a French chemist working in Spain, was born Sep. 26, 1754. In 1794, Proust published a paper, "Researches on Prussian blue," in which he first set down the law of definite proportions, or Proust's law, as it is commonly known.

在马德里期间，西班牙国王查理四世为他装备了非常豪华的皇家实验室，任命他为实验室主任。 他的实验室极适合做定量分析工作。 1806年普鲁斯特离开西班牙访问巴黎。 1808年法军攻占马德里时，皇家实验室被毁。 1816年他被选入法国科学院。 普鲁斯特的主要贡献是确立了定比定律。 从法国化学家 A.-L.拉瓦锡 和18世纪后期的著名化学家出版的著作中可以明显看出，化合物有固定组成的概念已被普遍接受。 然而，当时法国的化学权威 C.-L.贝托莱 关于化合物的组成可变的观 …

2018年6月11日 · PROUST, JOSEPH LOUIS (b.. Angers, France, 26 September 1754; d. Angers, 5 July 1826) chemistry. The second son of Joseph Proust, an apothecary, and Rosalie Sartre, Proust received his early education under the supervision of his godparents and continued it at the local Oratorian collège. He was then apprenticed to his father, to study pharmacy ...

French chemist famous for discovering the law of constant proportions, or Proust's law, according to which pure samples of a compound always contain the same elements in definite proportions. His views contradicted Claude-Louis Berthollet 's widely accepted claim that compound composition varies depending on how the compounds are prepared.