John Dalton

Amadeo Avogadro – Relating Volumes to Quantities and Avogadro’s Law

Amadeo Avogadro – Relating Volumes to Quantities and Avogadro’s Law

On August 9, 1776, Italian scientist Lorenzo Romano Amedeo Carlo Avogadro, Conte di Quaregna e Cerreto was born. He is most noted for his contribution to molecular theory now known as Avogadro’s law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. In tribute to him, the number of elementary entities (atoms, molecules, ions or other particles) in 1 mole…
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Jeremias Richter and the Law of Definite Proportions

Jeremias Richter and the Law of Definite Proportions

On March 10, 1762, German chemist Jeremias Benjamin Richter was born. He discovered the law of definite proportions and is best known for introducing the term stoichiometry, i.e. the calculation of relative quantities of reactants and products in chemical reactions. Youth and Education Jeremias Benjamin Richter was born at Hirschberg in Silesia, today’s Jelenia Góra in Western Poland. He graduated from the Hirschberg Gymnasium, and in 1778 joined the engineering corps of…
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Joseph Proust and the Law of Constant Composition

Joseph Proust and the Law of Constant Composition

Joseph Proust (1754-1826) 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. Joseph L. Proust was born on September 26, 1754 in Angers, France as the second son of Joseph Proust, an apothecary, and Rosalie Sartre. Joseph studied chemistry in his father’s shop and later came to…
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John Dalton and the Atomic Theory

John Dalton and the Atomic Theory

John Dalton (1766-1844) On September 6, 1766, English chemist, meteorologist and physicist John Dalton was born. He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness. He also recognised that the aurora borealis was an electrical phenomenon. John Dalton was born into a Quaker family at Eaglesfield, near Cockermouth, Cumberland, England, as son of a handloom weaver. Both he and his…
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Jöns Jacob Berzelius – One of the Founders of Modern Chemistry

Jöns Jacob Berzelius – One of the Founders of Modern Chemistry

On August 20, 1779, Swedish chemist Jöns Jacob Berzelius was born. Berzelius is considered, along with Robert Boyle, John Dalton, and Antoine Lavoisier, to be one of the founders of modern chemistry. In Sweden, Berzelius Day is celebrated on 20 August in honor of him. Jöns Jacob Berzelius was born in 1779 the son of Samuel Berzelius, a priest and teacher, who died of tuberculosis when Jöns was only four years old. In 1785…
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