Abstract

Atomism is the programme explaining all changes in terms of invariant units. The development of physics during the 20th century may be treated as a spectacular triumph of atomism. However, paradoxically, changes and conceptual difficulties brought about by quantum mechanics lead to the conclusion that the ontological model provided by classical atomism has become inadequate. Atoms (and elementary particles) are not atomos—indivisible, perfectly solid, unchangeable, ungenerated and indestructible (eternal), and the void is not simply an empty space. According to quantum mechanics and quantum field theory, there is no unchanging substance at all. If we want to understand contemporary notions of matter and develop an ontological model of the world, consistent with contemporary natural sciences, we should probably go beyond the conceptual framework of atomic philosophy