He returned to Paris before the end of the year, was well received by his family, and mixed in the cultivated circle which frequented his mother's salon, including Lebrun-Pindare, Antoine Lavoisier, Jean François Lesueur, Claude Joseph Dorat, and, a little later, the painter Jacques-Louis David.

In 1789, French nobleman and scientific researcher Antoine Lavoisier discovered the law of conservation of mass and defined an element as a basic substance that could not be further broken down by the methods of chemistry.

The Law of Conservation of Mass resulted in the reformulation of chemistry based on this law and the oxygen theory of combustion, which was largely based on the work of Lavoisier.

Chemistry as we know it today, was invented by Antoine Lavoisier with his law of Conservation of mass in 1783.

Although from a bourgeois family, after his degree in law Lavoisier became wealthy from a company set up to collect taxes for the Crown ; this allowed him to pursue experimental natural science as a hobby.

Lavoisier also formulated the law of Conservation of mass and discovered oxygen and hydrogen.

A few years previously, the French chemist Joseph Proust had proposed the law of definite proportions, which expressed that the elements combined to form compounds in certain well-defined proportions, rather than mixing in just any proportion ; and Antoine Lavoisier proved the law of conservation of mass, which helped out Dalton.

The person celebrated as the " father of modern chemistry " is Antoine Lavoisier ( 1743 – 1794 ) who developed his law of Conservation of mass in 1789, also called Lavoisier's Law.

# Lavoisier and Laplace ’ s law ( 1780 ): The energy change accompanying any transformation is equal and opposite to energy change accompanying the reverse process.

* 1789: Antoine Lavoisier discovers the law of conservation of mass, the basis for chemistry, and begins modern chemistry

* 1789-Antoine Lavoisier states the law of conservation of mass

* 1789 – Antoine Lavoisier: law of conservation of mass, basis for chemistry, and the beginning of modern chemistry

Chemistry then becomes a full-fledged science when Antoine Lavoisier develops his law of conservation of mass, which demands careful measurements and quantitative observations of chemical phenomena.

Despite all these advances, the person celebrated as the " father of modern chemistry " is Antoine Lavoisier who developed his law of conservation of mass in 1789, also called Lavoisier's Law.

Although the archives of chemical research draw upon work from ancient Babylonia, Egypt, and especially the Arabs and Persians after Islam, modern chemistry flourished from the time of Antoine Lavoisier, who is regarded as the " father of modern chemistry ", particularly for his discovery of the law of conservation of mass, and his refutation of the phlogiston theory of combustion in 1783.

He took his degree of doctor of medicine at Oxford in 1786, and, after visiting Paris, where he became acquainted with Lavoisier, was appointed reader in chemistry at Oxford University in 1788.

Antoine-Laurent de Lavoisier ( also Antoine Lavoisier after the French Revolution ; 26 August 17438 May 1794 ; ), the " father of modern chemistry ," was a French nobleman prominent in the histories of chemistry and biology.

The work of Lavoisier was translated in Japan in the 1840s, through the process of Rangaku.

Working with Pierre-Simon Laplace, Lavoisier conducted experiments that showed that respiration was essentially a slow combustion of organic material using inhaled oxygen.

Lavoisier was a powerful figure in the deeply unpopular Ferme Générale, 28 feudal tax collectors who were known to profit immensely by exploiting their position.

The first of these scientific concepts of acids and bases was provided by the French chemist Antoine Lavoisier, circa 1776.

The first scientific concept of acids and bases was provided by Lavoisier circa 1776.

The Lavoisier definition was held as absolute truth for over 30 years, until the 1810 article and subsequent lectures by Sir Humphry Davy in which he proved the lack of oxygen in H < sub > 2 </ sub > S, H < sub > 2 </ sub > Te, and the hydrohalic acids.

The idea that heat was a conservative quantity was invented by Lavoisier, and is called the ' caloric theory '; by the middle of the nineteenth century it was recognized as mistaken.

In 1772, Antoine Lavoisier used a lens to concentrate the rays of the sun on a diamond in an atmosphere of oxygen, and showed that the only product of the combustion was carbon dioxide, proving that diamond is composed of carbon.

David's portrait of Lavoisier, who was a chemist and physicist as well as an active member of the Jacobin party, was banned by the authorities for such reasons.

Also of interest – Lavoisier was a tax collector, as well as a famous chemist.

After he discovered that France was not self-sufficient in gunpowder, a Gunpowder Administration was established ; to head it, the lawyer Antoine Lavoisier was appointed.

* 1794 – Branded a traitor during the Reign of Terror by revolutionists, French chemist Antoine Lavoisier, who was also a tax collector with the Ferme Générale, is tried, convicted, and guillotined all on the same day in Paris.

Nitrogen gas was inert enough that Antoine Lavoisier referred to it as " mephitic air " or azote, from the Greek word ( azotos ) meaning " lifeless ".

" He compared Bukharin's situation to that of the great chemist Antoine Lavoisier who was guillotined during the French Revolution: " We in France, the most ardent revolutionaries ... still profoundly grieve and regret what we did ....

The name oxygen was coined in 1777 by Antoine Lavoisier, whose experiments with oxygen helped to discredit the then-popular phlogiston theory of combustion and corrosion.

Social invention did not have to await social theory any more than use of the warmth of a fire had to await Lavoisier or the buoyant protection of a boat the formulations of Archimedes.

In 1869, building upon earlier discoveries by such scientists as Lavoisier, Dmitri Mendeleev published the first functional periodic table.

Pierre-Simon Laplace and Antoine Lavoisier, in their 1780 treatise on heat, arrived at values ranging from 1, 500 to 3, 000 below the freezing-point of water, and thought that in any case it must be at least 600 below.

Portrait of Antoine-Laurent Lavoisier and his wife by Jacques-Louis David, ca.

Born to a wealthy family in Paris, Antoine-Laurent Lavoisier inherited a large fortune at the age of five with the passing of his mother.

In collaboration with Guettard, Lavoisier worked on a geological survey of Alsace-Lorraine in June 1767.

In 1771, at the age of 28, Lavoisier married 13-year-old Marie-Anne Pierrette Paulze, the daughter of a co-owner of the Ferme générale.

She created many sketches and carved engravings of the laboratory instruments used by Lavoisier and his colleagues.

She edited and published Lavoisier ’ s memoirs ( whether any English translations of those memoirs have survived is unknown as of today ) and hosted parties at which eminent scientists discussed ideas and problems related to chemistry.

Lavoisier demonstrated the role of oxygen in the rusting of metal, as well as oxygen's role in animal and plant respiration.

Lavoisier discovered that Henry Cavendish's " inflammable air ," which Lavoisier had termed hydrogen ( Greek for " water-former "), combined with oxygen to produce a dew which, as Joseph Priestley had reported, appeared to be water.

In " Réflexions sur le phlogistique " (" Reflections on Phlogiston ," 1783 ), Lavoisier showed the phlogiston theory to be inconsistent.

Lavoisier investigated the composition of water and air, which at the time were considered elements.

With the French chemists Claude-Louis Berthollet, Antoine Fourcroy and Guyton de Morveau, Lavoisier devised a systematic chemical nomenclature.

Lavoisier also did early research in physical chemistry and thermodynamics in joint experiments with Laplace.

Lavoisier also contributed to early ideas on composition and chemical changes by stating the radical theory, believing that radicals, which function as a single group in a chemical process, combine with oxygen in reactions.

However, much to his professional detriment, Lavoisier discovered no new substances, devised no really novel apparatus, and worked out no improved methods of preparation.

Lavoisier used a calorimeter to measure heat production as a result of respiration in a guinea pig.

Lavoisier used this measurement to estimate the heat produced by the guinea pig's metabolism.