- Kinetic model of matter is the assumption of tiny particles known as the atoms or molecules in continuous motion.

Arrangement of particles:
- The particles of solid are closely packed, regular pattern, high densities.
- The particles of liquid are arranged randomly with the particles slightly further apart compared to the solid, relatively high densities.
- The particles of gas are very far apart, randomly arranged, very low densities.

Movement of particles:
- The particles of the solid vibrate, held by very strong intermolecular bonds.
- The particles of the liquid are free to move with little space, attractive forces between them.
- The particles of the gas have the very little attraction, move about at high speeds.

- The higher the temperature, the more vigorous the motion of smoke will become due to the air molecules.