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Kinetic Theory

There are three states of matter;

solid, liquid and gas

Substances can change from one state to another. Kinetic theory can explain the change of state by considering all matter (substances) to be made of particles.

  • solid, particles are closely packed in a regular arrangement. The particles vibrate about a fixed position.


  • liquid, particles are closely packed in a random arrangement. The particles can move through the liquid but they cling together.


  • gas, The particles are far apart. There motion is random and independent of the other particles.


changing state