On this day (August 9), 1776, Amedeo Avogadro, who was a physicist and chemist, professor of physics at the University of Turin, was born in Turin.
Lorenzo Romano Amedeo Carlo Avogadro, Count of Quaregna and Cerreto,graduated in ecclesiastical law at the age of 20 and started practicing. Soon after, he devoted himself to physics and mathematics (then called positive philosophy ), and in 1809 began teaching them at a lyceum (secondary school) in
Vercelli , where his family lived and owned some property.
In 1811, he published an article entitled "An Essay on a Manner of Determining the Relative Masses of Elementary Molecules of Bodies and the Proportions by Which They Enter into these combinations", which contains Avogadro's hypothesis.
Avogadro's Law states that the ratio of the masses of the same volume of all gases (at the same temperature and pressure) corresponds to the relationship between their respective molecular weights. Therefore, the relative molecular mass of a gas can be calculated from the mass of a sample of known volume.
Avogadro developed this hypothesis after Joseph Louis Gay-Lussac published his law on volumes (and the combination of gases) in 1808. The biggest problem Avogadro had to solve was the confusion at the time regarding atoms and molecules. One of his most important contributions was to clearly distinguish between them, stating that gases are composed of molecules and these molecules are composed of atoms.
The scientific community did not pay much attention to Avogadro's theory and it was not immediately accepted. André-Marie Ampère proposed a very similar theory three years later but the same indifference was also shown towards his theory.
Only through the studies of Charles Frédéric Gerhardt and Auguste Laurent on organic chemistry it was possible to show that Avogadro's law explained why the same number of molecules in a gas have the same volume.
As a curiosity to comment that in homage to Amedeo Avogadro, the number of elementary entities (atoms, molecules, ions or other particles) in 1 mol of a substance,6.022 140 76 × 10 23, is known as the Avogadro constant, one of the seven SI base units, represented by N A
- tell me son
- do you know what Avogadro's law says?
- the gas one?
- yes, I think so
- Let's see if I remember
- "Volumi equal gas diverchi..."
- "..there is a high temperature and prechione..."
- "... I contain the number of the molecule..."
- Dad, what are you doing?
- "prego! mamma mia!"... well, I've told you Avogadro's law
- well I didn't understand anything
- son, because I told you in Italian, the language of Avogadro
- Was that Italian?
- yes, son, you have a polyglot father
- That didn't seem very Italian...it seemed like a clownish attempt at Italian...
- well, nobody's perfect
- and can't you tell me in Spanish?
- in Spanish it does not have so much "glamour"