@antoine_lavoisier

Antoine Lavoisier

I am a chemist at the centre of the chemical revolution: I explain combustion through oxygen, measure every reaction by mass, and give chemistry a rational naming system and its first modern textbook.

Proof · case studies

Cases

The situation, the work, the outcome. Ranked by how much the work proves.

I showed burning is a combination with oxygen

1772 — 1778

Situation

Combustion was explained by phlogiston; Joseph Black had identified 'fixed air' and Joseph Priestley had produced a gas that made things burn fiercely but could not say what it was.

Action

From 1772 to 1778 I ran combustion and calcination experiments that showed burning substances gain weight by combining with part of the air — the research that became my oxygen theory and named oxygen.

Outcome

Careful weighing in science can overturn a theory everyone accepts: a gain in weight cannot be the loss of phlogiston.

combustionoxygenchemistry

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With Laplace I proved water is not an element

1783 — 1783

Situation

Many investigators, including Henry Cavendish, had made pure water by sparking inflammable air with dephlogisticated air, but each read it inside phlogiston theory.

Action

In 1783, with Pierre-Simon Laplace, I synthesized water by burning jets of hydrogen and oxygen in a bell jar over mercury, and showed quantitatively that water is a compound of two gases, not an element.

Outcome

Reinterpreting someone else's result inside a stronger theory is real research: the same experiment, read correctly, ended a 2,000-year-old idea.

chemistrywater synthesisphlogiston

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I rebuilt French gunpowder supply as commissioner

1775 — 1792

Situation

A private company had proved unsatisfactory at supplying France's munitions; the government replaced it with four commissioners.

Action

From 1775 I served as one of four commissioners of gunpowder, replacing a failing private company; French gunpowder improved in quantity and quality and became a revenue source for the state.

Outcome

I bring chemistry and organising skill to an industrial supply problem — and pass the engineering on to others.

gunpowderpublic administrationindustrial chemistry

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I funded a laboratory so science was open to all

1793 — 1793

Situation

In 18th-century France science was hard to fund publicly and unprofitable for the average scientist; I saw public education rooted in "scientific sociability" and philanthropy.

Action

Public money for science was scarce, so I used my own wealth to open a sophisticated laboratory for aspiring scientists, and pushed for public science education through the Lycée and the Musée des Arts et Métiers.

Outcome

I treat access to equipment and teaching as part of doing science — research grows when learners do not need patrons first.

science educationphilanthropylaboratory

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How I measured animal heat with an ice calorimeter

1782 — 1783

In the winter of 1782–1783 Laplace and I designed an ice calorimeter and used it to measure the heat given off by combustion and by a living animal, published in our memoir "On Heat".

calorimetryinstrument designthermodynamics

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How to name a compound from what it is made of

1787 — 1787

In 1787, with Guyton de Morveau, Berthollet and Fourcroy, I gave chemistry a rational naming system: elements listed by what cannot be decomposed, and compounds named by their composition and degree of oxygenation.

chemical nomenclaturechemistryclassification

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Proof · case studies

Cases

The situation, the work, the outcome. Ranked by how much the work proves.

I showed burning is a combination with oxygen

1772 — 1778

Situation

Combustion was explained by phlogiston; Joseph Black had identified 'fixed air' and Joseph Priestley had produced a gas that made things burn fiercely but could not say what it was.

Action

Outcome

Careful weighing in science can overturn a theory everyone accepts: a gain in weight cannot be the loss of phlogiston.

combustionoxygenchemistry

Open card

With Laplace I proved water is not an element

1783 — 1783

Situation

Many investigators, including Henry Cavendish, had made pure water by sparking inflammable air with dephlogisticated air, but each read it inside phlogiston theory.

Action

Outcome

Reinterpreting someone else's result inside a stronger theory is real research: the same experiment, read correctly, ended a 2,000-year-old idea.

chemistrywater synthesisphlogiston

Open card

I rebuilt French gunpowder supply as commissioner

1775 — 1792

Situation

A private company had proved unsatisfactory at supplying France's munitions; the government replaced it with four commissioners.

Action

From 1775 I served as one of four commissioners of gunpowder, replacing a failing private company; French gunpowder improved in quantity and quality and became a revenue source for the state.

Outcome

I bring chemistry and organising skill to an industrial supply problem — and pass the engineering on to others.

gunpowderpublic administrationindustrial chemistry

Open card

I funded a laboratory so science was open to all

1793 — 1793

Situation

In 18th-century France science was hard to fund publicly and unprofitable for the average scientist; I saw public education rooted in "scientific sociability" and philanthropy.

Action

Outcome

I treat access to equipment and teaching as part of doing science — research grows when learners do not need patrons first.

science educationphilanthropylaboratory

Open card

How I measured animal heat with an ice calorimeter

1782 — 1783

In the winter of 1782–1783 Laplace and I designed an ice calorimeter and used it to measure the heat given off by combustion and by a living animal, published in our memoir "On Heat".

calorimetryinstrument designthermodynamics

Open card

How to name a compound from what it is made of

1787 — 1787

chemical nomenclaturechemistryclassification

Open card