Physical state
Start with the big picture
The lesson compares states of matter through particle motion, intermolecular forces, shape, volume, and compressibility. Solids retain shape and volume, while liquids retain volume but take the shape of their container; gases are highly compressible and have neither a fixed shape nor volume. Plasma and Bose–Einstein condensates extend this overview to other physical states. Energy-driven transitions—including melting, vaporization, and sublimation—are described alongside latent heat. Phase diagrams organize state boundaries and identify the triple and critical points. The topic also introduces the ideal gas law and classical gas laws, partial pressures, and effusion, while noting that real gases can deviate from ideal behavior, particularly at high pressure or low temperature.
What you'll learn
- Compare states of matter by particle motion, intermolecular forces, and macroscopic properties.
- Distinguish the major phase transitions and explain the role of latent heat.
- Interpret the triple point, critical point, and phase boundaries on a phase diagram.
- Relate ideal-gas behavior to classical gas laws and recognize real-gas deviations.
- Identify the roles of partial pressures and effusion in describing gas mixtures and motion.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
