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4. Latent Heat Phase Change and Latent Heat Heat and Heat Transfer > Phase Change and Latent Heat Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics?campaign_content=book_5818_section_122&campaign_term=Physics&utm_campaign=powerpoint&utm_medium= direct&utm_source=boundless

5. Energy is required to change the phase of a substance, such as the energy to break the bonds between molecules in a block of ice so it may melt. During a phase change energy my be added or subtracted from a system, but the temperature will not change. The temperature will change only when the phase change has completed. Latent Heat Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-9th-john-d-cutnell-kenneth-w-johnson-1118129172-9781118129173/heat-and-heat- transfer-13/phase-change-and-latent-heat-122/latent-heat-460- 11289?campaign_content=book_5818_section_122&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=bo undless Melting Icicle View on Boundless.com Heat and Heat Transfer > Phase Change and Latent Heat

6. The heat Q required to change the phase of a sample of mass m is given by [Equation 1] (melting or freezing) and [Equation 2] (evaporating or condensing), where Lf and Lv are the latent heat of fusion and the latent heat of vaporization, respectively. Heat and Heat Transfer > Phase Change and Latent Heat Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-9th-john-d-cutnell-kenneth-w-johnson-1118129172-9781118129173/heat-and-heat- transfer-13/phase-change-and-latent-heat-122/latent-heat-460- 11289?campaign_content=book_5818_section_122&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=bo undless Equation 1 View on Boundless.com Equation 2 View on Boundless.com

7. Free to share, print, make copies and changes. Get yours at www.boundless.com Appendix

8. Key terms latent heat of fusion the energy required to transition one unit of a substance from solid to liquid; equivalently, the energy liberated when one unit of a substance transitions from liquid to solid. latent heat of vaporization the energy required to transition one unit of a substance from liquid to vapor; equivalently, the energy liberated when one unit of a substance transitions from vapor to liquid. sublimation the transition of a substance from the solid phase directly to the vapor state such that it does not pass through the intermediate, liquid phase Free to share, print, make copies and changes. Get yours at www.boundless.com Heat and Heat Transfer

9. Heating and Phase Changes of Water A graph of temperature versus energy added. The system is constructed so that no vapor evaporates while ice warms to become liquid water, and so that, when vaporization occurs, the vapor remains in of the system. The long stretches of constant temperature values at 0ºC and 100ºC reflect the large latent heat of melting and vaporization, respectively. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. "Phase Change and Latent Heat." CC BY 3.0 http://cnx.org/content/m42225/latest/?collection=col11406/1.7 View on Boundless.comCC BY 3.0http://cnx.org/content/m42225/latest/?collection=col11406/1.7View on Boundless.com Heat and Heat Transfer

10. Melting Icicle Heat from the air transfers to the ice causing it to melt. Free to share, print, make copies and changes. Get yours at www.boundless.com Public Domain Pictures. "Icicle Drip Free Stock Photo - Public Domain Pictures." Public domain http://www.publicdomainpictures.net/view- image.php?image=8182&picture=icicle-drip View on Boundless.comPublic domainhttp://www.publicdomainpictures.net/view- image.php?image=8182&picture=icicle-dripView on Boundless.com Heat and Heat Transfer

11. Phase Transitions (a) Energy is required to partially overcome the attractive forces between molecules in a solid to form a liquid. That same energy must be removed for freezing to take place. (b) Molecules are separated by large distances when going from liquid to vapor, requiring significant energy to overcome molecular attraction. The same energy must be removed for condensation to take place. There is no temperature change until a phase change is complete. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. "Phase Change and Latent Heat." CC BY 3.0 http://cnx.org/content/m42225/latest/?collection=col11406/1.7 View on Boundless.comCC BY 3.0http://cnx.org/content/m42225/latest/?collection=col11406/1.7View on Boundless.com Heat and Heat Transfer

12. Heating Up Ice Andrew Vanden Heuvel explores latent heat while trying to cool down his soda. Free to share, print, make copies and changes. Get yours at www.boundless.com View on Boundless.com Heat and Heat Transfer

13. Free to share, print, make copies and changes. Get yours at www.boundless.com Heat and Heat Transfer The latent heat is the energy associated with A) the rearrangement of atoms in chemical reactions B) the configuration of a particular set of electrical charges C) movement of an object D) a phase change of a substance

14. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ Heat and Heat Transfer The latent heat is the energy associated with A) the rearrangement of atoms in chemical reactions B) the configuration of a particular set of electrical charges C) movement of an object D) a phase change of a substance

15. Free to share, print, make copies and changes. Get yours at www.boundless.com Heat and Heat Transfer The latent heat is measured in units of A) Joules B) kilograms C) Joules per kilogram D) Watts

16. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ Heat and Heat Transfer The latent heat is measured in units of A) Joules B) kilograms C) Joules per kilogram D) Watts

17. Attribution Connexions. "Phase Change and Latent Heat." CC BY 3.0 http://cnx.org/content/m42225/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42225/latest/?collection=col11406/1.7 Wikipedia. "Latent heat." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Latent_heatCC BY-SA 3.0http://en.wikipedia.org/wiki/Latent_heat Wiktionary. "sublimation." CC BY-SA 3.0 http://en.wiktionary.org/wiki/sublimationCC BY-SA 3.0http://en.wiktionary.org/wiki/sublimation Boundless Learning. "Boundless." CC BY-SA 3.0 http://www.boundless.com//physics/definition/latent-heat-of-vaporizationCC BY-SA 3.0http://www.boundless.com//physics/definition/latent-heat-of-vaporization Boundless Learning. "Boundless." CC BY-SA 3.0 http://www.boundless.com//physics/definition/latent-heat-of-fusionCC BY-SA 3.0http://www.boundless.com//physics/definition/latent-heat-of-fusion Free to share, print, make copies and changes. Get yours at www.boundless.com Heat and Heat Transfer