Proust, Joseph Louis (1754-1826)
Proust, Joseph Louis
Born: Angers (France), 1754
Died: Angers (France), 1826
Proust studied under Guillaume Francois Rouelle. In 1777 he became professor in Segovia, later in Salamanca and Madrid. In 1797 he formulated his law of constant proportions independent of the way a specific compound is synthesised. In a dispute with Berthollet 1801-1808 he defended his opinion by analysing many compounds. He returned to France in 1808. Proust also investigated several foodstuffs and discovered leucine.
French chemist who was the first to note that the completeness of chemical reactions depends in part upon the masses of the reacting substances.