phase chapcvnge and latent heat

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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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.



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?*uation 2


?*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


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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3elting cicle

7eat !rom the air trans!ers to the ice causing it to melt.


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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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7eating "p ce

Andrew Eanden 7euvel e#plores latent heat while trying to cool down his soda.



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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/


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=(

phase chapcvnge and latent heat

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