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===Examples===
: [[Water]] can exist as a [[liquid]] and a [[gas]] at 100[[°C]]. The [[Kinetic Energy Store|kinetic energy]] of the [[particle]]s in both is the same. However, the [[particle]]s in [[steam]] have more '''internal energy''' than the [[particle]]s in [[water]] because they are spread apart, giving them more [[Potential Energy|potential energy]].
: The [[particle]]s in [[petrol]] at 50[[°C]] are moving around so they have [[Kinetic Energy Store|kinetic energy]]. The [[petrol]] also has a store of [[Chemical Potential EnergyStore|chemical potential energy]] that can be released when [[petrol]] burns in the presence of [[Oxygen]]. So the '''Internal Energy''' of [[petrol]] includes both the [[Kinetic Energy Store|kinetic energy]] of the [[particle]]s and the [[Chemical Potential EnergyStore|chemical potential energy]].
==Key Stage 4==