Particle model

The simple particle model represents particles as small solid spheres. Depending on the substance, these particles may represent atoms, molecules or ions. The spheres are a way of showing arrangement and movement, not a literal picture of the particles.

The particle model explains these states by considering the arrangement, movement and energy of particles. Simple diagrams represent particles as small spheres. These spheres are a model, not tiny pieces that themselves have the bulk properties of a solid, liquid or gas.