Changes

: When the [[particlebond]]s in a between [[solid]] gain enough [[Potential Energy|potential energy]] to break the [[bondparticle]]s holding them in fixed positions the a [[substancesolid]] becomes or a [[liquid]].: When are broken the [[particle]]s in a [[liquid]] gain enough [[Potential Energy|potential energy]] to break the [[bond]]s keeping them together the . This is an [[substanceendothermic]] becomes a process because it needs [[gasenergy]].  : When a [[substancebond]] changes from s are formed between [[solidparticle]] to s in a [[liquidgas]] and or a [[liquid]] to [[gas]] the [[particle]]s need to gain lose [[Potential Energy|potential energy]]. This is an [[exothermic]] process because [[energy]] is given off.