Antoine Lavoisier — "Nothing is lost, nothing is created, everything is transformed."
Nothing is lost, nothing is created, everything is transformed.
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More from Antoine Lavoisier
"It took them only an instant to cut off that head, but France may not produce another like it in a century."
"I have been so lucky in life, that I have had nothing to do but to collect the fruits of the labours of others."
"The desire to do good is the most powerful motive of all."
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Details
A foundational statement of the law of conservation of mass, though the exact phrasing varies in translations
Date: 1789
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Understanding this quote
What it means
Matter cannot be created from nothing or destroyed into nothing — it only changes form. When wood burns, it becomes ash, gases, and heat; the total mass remains unchanged. This principle underpins all of chemistry and physics: atoms are rearranged, never annihilated. In modern science, this became the law of conservation of mass and, extended by Einstein, conservation of mass-energy. Transformation, not creation or destruction, is the fundamental rule of the universe.
Relevance to Antoine Lavoisier
Lavoisier proved this through meticulous quantitative experiments in the 1770s–1780s, carefully weighing reactants and products in sealed vessels. By disproving phlogiston theory and showing combustion consumes oxygen rather than releasing a mysterious fire-element, he demonstrated matter merely transforms. He named oxygen and hydrogen, co-created the first systematic chemical nomenclature, and wrote Traité Élémentaire de Chimie — the first modern chemistry textbook. This quote is the foundational law his entire career was built on.
The era
Lavoisier worked during the late 18th-century Enlightenment, when rational inquiry was dismantling centuries of alchemical mysticism. Phlogiston theory — claiming substances release a fire-element during burning — dominated chemistry. The French Revolution simultaneously upended society; as a tax collector for the Crown, Lavoisier was guillotined in 1794 during the Reign of Terror. His principle that matter transforms rather than appears or vanishes was radical when creation ex nihilo still carried profound theological and philosophical weight.
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