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===About Convection===
: [[Convection]] happens in [[fluid]]s ([[liquid]]s or [[gas]]es) because [[particle]]s can move past one another.
: When a [[fluid]] is [[heating|heated]] [[particle]]s move more quickly and spread further apart. This makesthe [[fluid]] less [[density|dense]]. The less [[density|dense]] [[fluid]] rises. After the [[fluid]] has moved away from the heater it cools down, the [[particle]]s move more slowly coming closer together. This makes the [[fluid]] more [[density|dense]] so it sinks back towards the heater. {| class="wikitable"|-|[[File:Convection.gif|center|]]|}