1 janv. 400 av. J.-C. - All matter consists of small particles called atoms
-Atoms are indestructible
-Atoms are solid but invisible
-Atoms are homogeneous
-Atoms differ in size, shape, mass, position, and arrangement
-Solids are made of small pointy, atoms
-liquids are made of large round atoms
-oils are made of very fine, small atoms that can slip past each other