phase chapcvnge and latent heat
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7/25/2019 Phase Chapcvnge and Latent Heat
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6 Latent 7eat
hase 8hange and Latent 7eat
Heat and Heat Transfer > Phase Change and Latent Heat
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6 ?nergy is re*uired to change the phase o! a substance, such as the energy to
break the bonds between molecules in a block o! ice so it may melt.
6 @uring a phase change energy my be added or subtracted !rom a system, but the
temperature will not change. The temperature will change only when the phase
change has completed.
Latent 7eat
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3elting cicle
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6The heat re*uired to change the phase o! a sample o! mass m is given by ?*uation 2H Imelting
or !ree&ingJ and ?*uation 'H Ievaporating or condensingJ, where L! and Lv are the latent heat o!
!usion and the latent heat o! vapori&ation, respectively.
Heat and Heat Transfer > Phase Change and Latent Heat
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?*uation 2
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?*uation '
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Appendi#
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5ey terms
6 latent heat o! !usion the energy re*uired to transition one unit o! a substance !rom solid to li*uidK e*uivalently, the energy
liberated when one unit o! a substance transitions !rom li*uid to solid.
6 latent heat o! vapori&ation the energy re*uired to transition one unit o! a substance !rom li*uid to vaporK e*uivalently, theenergy liberated when one unit o! a substance transitions !rom vapor to li*uid.
6 sublimation the transition o! a substance !rom the solid phase directly to the vapor state such that it does not pass through the
intermediate, li*uid phase
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Heat and Heat Transfer
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7eating and hase 8hanges o! %ater
A graph o! temperature versus energy added. The system is constructed so that no vapor evaporates while ice warms to become li*uid water, and so
that, when vapori&ation occurs, the vapor remains in o! the system. The long stretches o! constant temperature values at (8 and 2((8 re!lect the large
latent heat o! melting and vapori&ation, respectively.
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Connexions.Mhase 8hange and Latent 7eat.M88 B$ .(http-//cn#.org/content/m='''N/latest/9collection;col22=(
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3elting cicle
7eat !rom the air trans!ers to the ice causing it to melt.
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Public Domain Pictures.Mcicle @rip Free Stock hoto + ublic @omain ictures.M ublic domain
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Heat and Heat Transfer
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hase Transitions
IaJ ?nergy is re*uired to partially overcome the attractive !orces between molecules in a solid to !orm a li*uid. That same energy must be removed !or
!ree&ing to take place. IbJ 3olecules are separated by large distances when going !rom li*uid to vapor, re*uiring signi!icant energy to overcome
molecular attraction. The same energy must be removed !or condensation to take place. There is no temperature change until a phase change is
complete.
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Connexions.Mhase 8hange and Latent 7eat.M88 B$ .(http-//cn#.org/content/m='''N/latest/9collection;col22=(
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7eating "p ce
Andrew Eanden 7euvel e#plores latent heat while trying to cool down his soda.
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Heat and Heat Transfer
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Heat and Heat Transfer
The latent heat is measured in units o!
AJ Ooules per kilogram
BJ Ooules
8J kilograms
@J %atts
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Boundless - LO.MBoundless.M 88 B$+SA .(http-//www.boundless.com/
Heat and Heat Transfer
The latent heat is measured in units o!
AJ Ooules per kilogram
BJ Ooules
8J kilograms
@J %atts
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Attribution
6Connexions.Mhase 8hange and Latent 7eat.M 88 B$ .(http-//cn#.org/content/m='''N/latest/9collection;col22=(
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