Chapter 19 - Thermal Properties of Materials (Chapter 19)...

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1 Thermal Properties of Materials (Chapter 19) Thermal images of a dog (left) and a snake wrapped around a human arm (right).
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2 What you should understand by the end of this chapter: The main parameters that characterize the thermal behaviour of materials. Heat capacity and specific heat. Thermal expansion coefficient. Thermal conductivity. How these concepts are applied to thermal protection systems (e.g. space shuttle tiles).
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3 1. Heat Capacity Energy content in a material depends on. . . … temperature. … the material. Heat capacity: C represents energy needed to raise one mole of a solid by one degree (J/mol-K). It can be measured either at constant volume C v , or constant pressure C p . C p is somewhat larger than C v . We also define the specific heat ( c ) as energy per unit mass per degree (J/kg-K). The heat capacity measures the energy content of a material. dT dQ C =
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4 Physical Basis Atoms vibrate within the solid. They are constrained by surrounding atoms because of bonding. Energy propagates like an elastic wave. This is the basis for sound transmission. Simplest model: 3-D solid Î 3 vibrational modes Heat content 3 kT per atom or 3 RT per mole
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5 Heat capacity is sensitive to temperature. At low T (
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Chapter 19 - Thermal Properties of Materials (Chapter 19)...

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