Aristotle Writes the Physics
Four elements, a natural place for everything, and a theory that ruled for two thousand years
Quick facts
- Treatise
- Physics, c. 350 BCE
- Four terrestrial elements
- Earth, water, air, fire
- Cosmological model
- Geocentric, with Earth at the center
- Approximate span of dominance
- c. 350 BCE to 1500s CE
What happened
Aristotle set out the first systematic theory of motion and matter in his treatise Physics, likely composed as lecture notes for his school in Athens around 350 BCE. He held that all terrestrial matter was made of four elements, earth, water, air, and fire, each defined by a pair of qualities such as hot, cold, wet, or dry, and each with a natural place in a cosmos centered on the stationary Earth. Earth and water had a natural tendency to fall toward the center, while air and fire had a natural tendency to rise, and objects displaced from their natural place moved back toward it in straight lines until they arrived and stopped. Celestial bodies, made of a separate fifth element, moved instead in perfect, eternal circles. Aristotle held that heavier objects fell faster than lighter ones, and that a moving object required a continuous mover in contact with it, since motion without a sustaining cause was, to him, unnatural.
Why it matters
Aristotle's physics gave the ancient and medieval world its first coherent framework for explaining everyday motion, and it dominated Western natural philosophy for centuries. A Purdue University history of chemistry page notes his theories were used until roughly the 1500s CE, when Copernicus, and later Galileo, began dismantling the geocentric cosmos and the theory of natural motion built on top of it. Nearly every event in this timeline's first two eras is, in some way, a response to or a departure from Aristotle's claims.
How we know
Aristotle's Physics survives as a complete Greek text transmitted through antiquity and the medieval manuscript tradition, supplemented by his other treatises On the Heavens and On Generation and Corruption, which historians of science use to reconstruct his full physical system.
Sources
- World History Encyclopedia. Aristotle's On the Heavens · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- Purdue University, Department of Chemistry. Aristotle · Reputable sourcechemed.chem.purdue.edu · The domain "chemed.chem.purdue.edu" is on our Reputable source registry.
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