chapter10.1-10.3_slides

chapter10.1-10.3_slides - 11/1/2009 Part 2: Thermodynamics...

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11/1/2009 1 Part 2: Thermodynamics Chapter 10 Thermal Physics What does “hot” and “cold” mean? How is temperature defined/measured? Can you cool things to as low temperature as you want? (at least in principle). Or , is there a place in the universe where the temperature is -500 o F? - No. There is a lowest temperature absolute zero. How about the opposite? Is there a highest temperature? Thermal physics is the study of Temperature Heat How these affect matter
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11/1/2009 2 What is temperature? - Common sense: tells how hot or cold an object is But our feeling is not reliable. - Try to touch a piece of metal and a piece of wood in a cold buffalo winter day - same temperature, feels very differently Need scientific definition and measurement But first, let’s examine how “hot” or “cold” are felt We feel a thing is hot or cold by touching it thermal contact Two objects are in thermal contact if energy can be exchanged between them The energy exchanged is called heat Thermal equilibrium exists when two objects in thermal contact with each other cease to exchange energy
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11/1/2009 3 If objects A and B are separately in thermal equilibrium with a third object, C, then A and B are in thermal equilibrium with each other Allows a definition of temperature:
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chapter10.1-10.3_slides - 11/1/2009 Part 2: Thermodynamics...

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