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===Limitations of the Particle Model===
: The '''particle model''' is not a complete explanation for the properties of a [[material]]. However, it is a useful [[approximation]] which can make predictions about the properties of [[solid]]s, [[liquid]]s and [[gas]]es but is not perfect.
: The '''particle model''' only explains the properties of [[solid]]s, [[liquid]]s and [[gas]]es but not why different [[material]]s are [[solid]], [[liquid]] or [[gas]] at different [[temperature]]s.
The problems with the