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chemistry
Leopold Gmelin and the Chemistry of Digestion

Leopold Gmelin and the Chemistry of Digestion

Harald Sack
On August 2, 1788, German chemist Leopold Gmelin was born. Gmelin discovered potassium ferrocyanide (1822), devised Gmelin‘s test for bile pigments and researched the chemistry of digestion. He published the notable Handbook of Chemistry to comprehensively survey the subject. This was the first thorough update since the era of Lavoisier‘s influence.[4] He also coined the names ester, ketone and racemic acid. Leopold Gmelin – Early Years Gmelin was born in Göttingen, Germany, the…
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chemistry
Joseph Louis Gay-Lussac and his Work on Gases

Joseph Louis Gay-Lussac and his Work on Gases

Tabea Tietz
On December 6, 1778, French chemist and physicist Joseph Louis Gay-Lussac was born. He is known mostly for two laws related to gases, and for his work on alcohol-water mixtures, which led to the degrees Gay-Lussac used to measure alcoholic beverages in many countries. “I have not chosen a career that will lead me to a great fortune, but not my principal ambition. In fact, later in life he enjoyed comfortable income…
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chemistry
John Dalton and the Origins of the Atomic Theory

John Dalton and the Origins of the Atomic Theory

Harald Sack
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. “Philosophers are generally persuaded, that the sensations of heat and cold are occasioned by the presence or absence, in degree, of certain principle or quality denominated fire or…
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engineering
John Gorrie and the Wonders of Air Condition

John Gorrie and the Wonders of Air Condition

Harald Sack
On June 29, 1855, American physician, scientist, inventor, and humanitarian John Gorrie passed away. He is considered the father of refrigeration and air conditioning. Today, refrigeration as well as air condition has become a commodity. But, the importance of refrigeration to modern civilization as a means for conservation of food cannot be overestimated. A Brief History of Refrigeration Actually, even already in prehistoric times man was using ice to refrigerate and thus…
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astronomy
Urbain Le Verrier and the hypothetical Planet Vulcan

Urbain Le Verrier and the hypothetical Planet Vulcan

Tabea Tietz
On 2 January 1860, French astronomer Urbain Le Verrier announced the discovery of Vulcan, a hypothetical planet inside the Mercury orbit, to a meeting of the Académie des Sciences in Paris. Despite the lack of any reliable observation, Le Verrier really was convinced until his death that he had discovered a new planet. It was Einstein’s special theory of relativity and a completely new understanding of the laws of gravity that modified the predicted…
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chemistry
Amedeo Avogadro – Relating Volumes to Quantities and Avogadro’s Law

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

Harald Sack
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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