Chapter 11b - Chapter 11B 1 Thermal Energy and Temperature...

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Unformatted text preview: Chapter 11B 1 Thermal Energy and Temperature If we slowly add thermal energy to a substance, two things will happen: • Its temperature will increase. • At certain temperatures it will change phase (melt or vaporize). Its temperature will remain constant while it is changing phase. Chapter 11B 2 Latent Heat and Phase Changes Solids will melt if enough energy is added. Liquids will freeze if enough energy is removed. Liquids will vaporize if enough energy is added. Gases will condense if enough energy is removed. The substance’s temperature remains constant during these phase changes. Chapter 11B 3 Latent Heat and Phase Changes “Latent heat” is the amount of thermal energy that must be added or removed to cause one kilogram of matter to change phase: • latent heat of fusion, L f (solid to liquid, liquid to solid) • latent heat of vaporization, L v (liquid to vapor, vapor to liquid) Q = mL f Q = mL v Chapter 11B 4 Latent Heat and Phase Changes If we add enough energy to 1kg of ice at -50 ° C it will be converted into steam at 100 ° C: Q 1 = mc ∆ T = 1 kg (...
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This note was uploaded on 04/28/2008 for the course PHY 111 taught by Professor Scott during the Winter '07 term at Saginaw Valley.

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Chapter 11b - Chapter 11B 1 Thermal Energy and Temperature...

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