Boyle Publishes The Sceptical Chymist and Questions the Four Elements
An Anglo-Irish experimenter argues nobody has actually proven what an element is
Quick facts
- Experimenter
- Robert Boyle, 1627 to 1691
- Work
- The Sceptical Chymist, 1661
- Related law
- Boyle's law, stated 1662: gas volume varies inversely with pressure
What happened
Robert Boyle, the fourteenth child of the Earl of Cork who spent the Civil War years at Oxford experimenting with a circle of natural philosophers, published The Sceptical Chymist in London in 1661. Written as a dialogue among several debaters, the book challenged both the ancient Aristotelian claim that all matter is built from four elements, earth, air, fire, and water, and the alchemical claim, following Paracelsus, that three principles, sulfur, mercury, and salt, underlie all substances. Boyle argued that neither camp had ever actually demonstrated these building blocks through experiment; they had merely inherited the claims. He proposed defining an element as a body that cannot be broken down into anything simpler by any known chemical operation, and argued matter was built from corpuscles, tiny particles in motion, whose combinations produced the different substances observed. The year before, in 1660, Boyle had already published New Experiments Physico-Mechanicall, Touching the Spring of the Air, describing air-pump experiments that created a partial vacuum and studied the physical behavior of air.
Why it matters
Boyle's insistence that claims about matter had to be tested by experiment, not inherited from Aristotle or Paracelsus, is why historians of chemistry treat The Sceptical Chymist as marking chemistry's separation from alchemy into an experimental science with falsifiable claims. His air-pump work fed directly into the 1662 statement of what became known as Boyle's law, that a gas's volume varies inversely with the pressure on it, one of the first quantitative physical laws derived purely from repeated experimental measurement.
How we know
The Sceptical Chymist survives in its original 1661 printing and has been excerpted and annotated by historians of chemistry; Le Moyne College's chemistry history archive reproduces Boyle's own dialogue text, and the Science History Institute's biography of Boyle documents the 1660 air-pump work and the 1662 statement of Boyle's law from the printed editions of both books.
Sources
- John Andraos and W. B. Jensen materials, Le Moyne College chemistry history archive. Robert Boyle, a Sceptical Chymist · Reputable sourceweb.lemoyne.edu · The domain "web.lemoyne.edu" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- Science History Institute. Robert Boyle · General sourcesciencehistory.org · Cited as a "reference" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
See something wrong? . Corrections with a source get fixed fastest.
Part of a timelineThe Scientific Revolution20 events · How observation and mathematics replaced ancient authority between 1543 and 1727View all →