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DDiissccoovveerriinngg SScciieennccee 
PP55
Evaporation
DDeessccrriippttiioonn 
WWhheenn wwaarrmm wwaatteerr 
vvaappoouurr ffrroomm tthhee 
ssuurrrroouunnddiinngg aaiirr 
ttoouucchheess tthhee ccoollddeerr 
ssuurrffaaccee ooff tthhee ggllaassss,, 
lloosseess hheeaatt aanndd 
ccoonnddeennsseess iinnttoo wwaatteerr 
ddrroopplleettss oonn tthhee oouutteerr 
ssuurrffaaccee ooff tthhee ggllaassss.. 
CCoolldd wwaatteerr
DDeessccrriippttiioonn 
 WWhheenn tthhee wwaarrmm 
wwaatteerr vvaappoouurr ffrroomm tthhee 
hhoott wwaatteerr rriisseess aanndd 
ttoouucchheess tthhee ccoollddeerr 
ssuurrffaaccee ooff tthhee ppllaassttiicc 
wwrraapp,,lloosseess hheeaatt aanndd 
ccoonnddeennsseess iinnttoo wwaatteerr 
ddrroopplleettss oonn tthhee iinnnneerr 
ssuurrffaaccee ooff tthhee ppllaassttiicc 
wwrraapp.. 
HHoott wwaatteerr
DDiiffffeerreennccee 
PPrroocceessss:: 
EEvvaappoorraattiioonn 
CCoonnddeennssaattiioonn 
FFrreeeezziinngg 
MMeellttiinngg 
bbooiilliinngg 
SSttaatteess:: 
LLiiqquuiidd 
SSoolliidd 
ggaasseeoouuss
TThhee pprroocceessss 
EEvvaappoorraattiioonn--ggaaiinnss hheeaatt 
CCoonnddeennssaattiioonn--lloosseess hheeaatt 
FFrreeeezziinngg--lloosseess hheeaatt 
MMeellttiinngg--ggaaiinnss hheeaatt 
BBooiilliinngg--ggaaiinnss hheeaatt
SSoolliidd 
IInnssiiddee tthhee ssoolliidd,, tthhee ppaarrttiicclleess aarree vveerryy 
ssqquueeeezzyy!! 
TThhaatt iiss wwhhyy ssoolliidd hhaass aa ddeeffiinniittee sshhaappee
LLiiqquuiidd 
IInnssiiddee tthhee lliiqquuiidd,, tthhee ppaarrttiicclleess aarree nnoott ssoo 
ssqquueeeezzyy!! 
IItt ccaann mmoovvee qquuiittee ffrreeeellyy aarroouunndd..
AAiirr 
IInnssiiddee tthhee aaiirr,, tthhee ppaarrttiicclleess ccaann mmoovvee 
ffrreeeellyy 
TThhaatt’’ss wwhhyy wwee ccaannnnoott sseeee aanndd iitt ccaann bbee 
ccoommpprreesssseedd
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