In this third lesson on the states of matter, students explored the arrangement of particles in solids, liquids, and gases, recognizing that materials are composed of tiny particles. The lesson emphasized the fixed, rigid structure of particles in solids, such as a table, compared to the looser arrangements in liquids and gases. Through simulations, the concept of matter transforming from solid to liquid and beyond was demonstrated, alongside translations such as مادة صالحة (valid/solid material) in Arabic and detailed particle behavior descriptions in both languages.