How did Democritus convince the Greeks that substances were made of particles?

Democritus convinced the Greeks of his atomic theory by proposing that all matter is composed of indivisible particles called atoms, which are eternal and unchangeable. He used logical reasoning and observations about the nature of matter, suggesting that as substances are divided, they eventually reach a point where they can no longer be divided without losing their identity. His ideas contrasted with the prevailing views of his time, emphasizing that the properties of substances arise from the arrangement and motion of these atoms. However, his theories lacked experimental evidence and were not widely accepted until much later.