The kinetic theory of matter

The kinetic theory helps to explain the way in which matter behaves. The evidence is consistent with the idea that all matter is made up of tiny particles. This theory explains the physical properties of matter in terms of the movement of its constituent particles.

The main points of the theory are:
  • All matter is made up of tiny, moving particles, invisible to the naked eye. Different substances
  • have different types of particles (atoms, molecules, or ions) that have different sizes.
  • The particles move all the time. The higher the temperature, the faster they move on average.
  • Heavier particles move more slowly than lighter ones at a given temperature.
The kinetic theory can be used as a scientific model to explain how the arrangement of particles relates to the properties of the three states of matter.

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