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: [[Scientific Evidence|Evidence]] of the '''particle model''' can be shown by pouring 50[[ml]] of [[pure]] [[water]] and 50[[ml]] of [[pure]] [[ethanol]] into a [[Measuring Cylinder|measuring cylinder]]. The [[solution]] is only 97[[ml]] because [[ethanol]] [[molecule]]s are bigger than [[water]] [[molecule]]s so the [[water]] [[molecule]]s fit between the [[ethanol]] [[molecule]]s like pouring 50[[ml]] of sand and 50[[ml]] of marbles into the same container. It will not make 100[[ml]].
: [[Scientific Evidence|Evidence]] of the '''particle model''' can be shown by observing [[Brownian Motion]].
==Key Stage 4==
===Meaning===
The '''particle model''' is a [[Scientific Theory|scientific theory]] that [[explain]]s the [[property|properties]] of [[solid]]s, [[liquid]]s and [[gas]]es by suggesting that all [[matter]] is made of [[particle]]s, and that those [[particle]]s behave differently in [[solid]]s, [[liquid]]s and [[gas]]es.
===About The Particle Model===
: The '''particle model''' describes how the [[particle]]s that make a [[solid]], [[liquid]] or [[gas]] are arranged and how they move.
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Diagram'''
| style="height:20px; width:200px; text-align:center;" |'''Arrangement'''
| style="height:20px; width:200px; text-align:center;" |'''Motion'''
|-
|[[File:ParticleModelSolid.png|center|200px]]
| style="height:20px; width:200px; text-align:center;" |The [[particle]]s are in a regular arrangement and very close together.
| style="height:20px; width:200px; text-align:center;" |The [[particle]]s [[vibrate]] around fixed positions.
|-
|[[File:ParticleModelLiquid.png|center|200px]]
| style="height:20px; width:200px; text-align:center;" |The [[particle]]s are in a random arrangement with small gaps between them.
| style="height:20px; width:200px; text-align:center;" |The [[particle]]s can slide past one another.
|-
|[[File:ParticleModelGas.png|center|200px]]
| style="height:20px; width:200px; text-align:center;" |The [[particle]]s are in a random arrangement and spread far apart from one another.
| style="height:20px; width:200px; text-align:center;" |The [[particle]]s are free to move in all directions.
|}
===Limitations of the Particle Model===