The Kinetic Molecular Theory  
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The Kinetic Molecular Theory explains the forces between molecules and the energy that they possess. This theory has 3 basic assumptions.

1.   Matter is composed of small particles (molecules).

2. The measure of space that the molecules occupy (volume) is derived from the space in-between the molecules and not the space the molecules contain themselves.

3.  The molecules are in constant motion. This motion is different for the 3 states of matter.

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