How can we explain the properties of solids, liquids and gases?
What is the particle modelDiffusion - Evidence for the particle theory of matter.Â
What is diffusionHow does Brownian motion provide evidence for the particle model?
What is Brownian motion
How do substances change from one state to another?Why do solids, liquids and gases have different densities?
Why do solids, liquids and gases have different densities?