He proposed that matter, when small enough, reaches a point where it can no longer be divided and becomes atoms, meaning "individual".
Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible, and that they moved in infinite numbers through empty space until they stopped. In the philosophy of Democritus, atoms existed not only for matter, but also for such properties as perception and the human soul.
Democritus developed his atomic philosophy as a middle ground between the two opposing Greek theories of reality and the illusion of change. He argued that matter is divided into indivisible and immutable particles that create the appearance of change when they combine and separate from each other.
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