The document summarizes the kinetic model of matter. It states that all matter is made of tiny particles in continuous, random motion. The three states of matter - solids, liquids, and gases - differ in how tightly packed and how freely the particles can move. Solids have tightly packed particles that vibrate in fixed positions. Liquids have less tightly packed particles that can flow by sliding over one another. Gases have widely spaced particles that move freely in all directions. The kinetic model also describes relationships between pressure, temperature, and volume for gases.