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→Key Stage 4
: [[Material|Materials]] can be [[solid]], [[liquid]] or [[gas]].
: The '''state of matter''' can be altered by changing the [[temperature]] of the [[material]] or changing the [[pressure]] on the [[material]].
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |[[Thermal Conduction]] is very poor in a [[gas]]es.
|}
====Why isn't everything a gas?====
: When [[particle]]s are near each other, they tend to stick together. This is due to [[force]]s acting between [[adjacent]] [[particle]]s. When two [[particle]]s are near one another they are [[attracted]] together. This causes those [[particle]]s to come together. Without this [[force]] of [[attraction]] between particles they would not stick together and there would be no [[solid]] or [[liquid]] '''states'''.
: What determines if a [[substance]] is a [[solid]], [[liquid]] or [[gas]] at [[Room Temperature|room temperature]] is how big that [[force]] of [[attraction]] is.
====Why Solids and Liquids exist====
: Different [[substance]]s have a different [[force]] of [[attraction]] between the [[adjacent]] [[particle]]s.
: Silicon dioxide (sand and glass) is [[solid]] at [[Room Temperature|room temperature]] because there is a strong [[force]] of [[attraction]] between [[adjacent]] [[molecule]]s.
: [[Water]] is a [[liquid]] at [[room temperature]] because the [[force]] of [[attraction]] is not great enough to hold the [[molecule]]s in position. However, it is great enough to keep them together.
: [[Oxygen]] is a gas at [[room temperature]] because there is a very weak [[force]] of [[attraction]] between [[adjacent]] [[molecules]].