8 9 2 – 9 8 ▁ ▁References ▁ ▁Category : St re ets ▁in ▁the ▁City ▁of ▁West min ster ▁Category : May f air <0x0A> </s> ▁The ▁R ibe ir ão ▁da ▁Paz ▁is ▁a ▁river ▁of ▁Par á ▁state ▁in ▁north - central ▁Brazil . ▁ ▁See ▁also ▁List ▁of ▁rivers ▁of ▁Par á ▁ ▁References ▁Brazil ian ▁Ministry ▁of ▁Transport ▁ ▁Category : R ivers ▁of ▁Par á <0x0A> </s> ▁A ▁phase ▁change ▁material ▁( PC M ) ▁is ▁a ▁subst ance ▁which ▁releases / abs or bs ▁sufficient ▁energy ▁at ▁phase ▁transition ▁to ▁provide ▁useful ▁heat / co ol ing . ▁ ▁Gener ally ▁the ▁transition ▁will ▁be ▁from ▁one ▁of ▁the ▁first ▁two ▁fundamental ▁states ▁of ▁matter ▁- ▁solid ▁and ▁liquid ▁- ▁to ▁the ▁other . ▁ ▁The ▁phase ▁transition ▁may ▁also ▁be ▁between ▁non - class ical ▁states ▁of ▁matter , ▁such ▁as ▁the ▁conform ity ▁of ▁cry st als , ▁where ▁the ▁material ▁goes ▁from ▁conform ing ▁to ▁one ▁cry st all ine ▁structure ▁to ▁conform ing ▁to ▁another , ▁which ▁may ▁be ▁a ▁higher ▁or ▁lower ▁energy ▁state . ▁▁ ▁The ▁energy ▁released / abs or bed ▁by ▁phase ▁transition ▁from ▁solid ▁to ▁liquid , ▁or ▁vice - vers a , ▁the ▁heat ▁of ▁fusion ▁is ▁generally ▁much ▁higher ▁than ▁the ▁sensible ▁heat . ▁ ▁Ice , ▁for ▁example , ▁requires ▁ 3 3 3 . 5 5 ▁J / g ▁to ▁m elt , ▁but ▁then ▁water ▁will ▁rise ▁one ▁degree ▁further ▁with