Antoine Laurent de Lavoisier, born in France on August 26, 1743, a great scientist, received careful education. He was the son of a rich family. He graduated in law, but his vocation was for the sciences. He worked in various public agencies. He was a member of the French Academy of Sciences and is considered one of the founders of Modern Chemistry.
In 1771, he married the young aristocrat Marie-Anne Pierrette Paulze. It was she who translated some of her works. He made illustrations of his main experiments.
Lavoisier discovered the composition of water: oxygen and hydrogen. It also determined the composition of a given volume of air: 78% nitrogen, 21% oxygen, 0.9% argon gas, 0.03% carbon dioxide and 0.07% other gases. His is the famous phrase about the law of conservation of mass or conservation of matter:
"In nature, nothing is lost, nothing is created, matter only changes."
It was linked to politics, to the previous political regime. I had enlightenment ideas. He was at the head of the General Farm of France. Due to the taxes this organ charged, it became hated by the revolts of the French Revolution. Lavosier was then sentenced to guillotine on May 8, 1794, at the age of 50. From his death was said:
"It took just a moment to cut off my head that maybe a century will not produce another like it."