Chapter 7-Lecture 12_1

Chapter 7-Lecture 12_1 - Chapter 7 Thermal Properties...

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1 ISSUES TO ADDRESS. .. How do materials respond to the application of heat ? How do we define and measure. .. -- heat capacity? -- thermal expansion? -- thermal conductivity? -- thermal shock resistance? How do the thermal properties of ceramics, metals, and polymers differ? Chapter 7: Thermal Properties
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2 Quantitatively: The energy required to produce a unit rise in temperature for one mole of a material. heat capacity (J/mol-K) energy input (J/mol) temperature change (K) Heat Capacity Two ways to measure heat capacity: C p : Heat capacity at constant pressure. C v : Heat capacity at constant volume. C p usually > C v • Heat capacity has units of ° - F mol lb Btu K mol J dT dQ C = The ability of a material to absorb heat
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Heat capacity. .. -- increases with temperature -- for solids it reaches a limiting value of 3 R From atomic perspective: -- Energy is stored as atomic vibrations. -- As temperature increases, the average energy of atomic vibrations increases. Dependence of Heat Capacity on
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This note was uploaded on 10/03/2011 for the course EMCH 371 taught by Professor Dai-hattrick during the Spring '11 term at South Carolina.

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Chapter 7-Lecture 12_1 - Chapter 7 Thermal Properties...

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