thermal_4_02_02_2011 - Heat Up until the early 1800s, heat...

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Heat Up until the early 1800’s, heat was thought to be an invisible fluid that flowed out of one object and into another. Now we know that heat energy is associated with the motion of molecules and atoms inside an object. misconception
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Misconception If heat is a fluid, will we eventually run out of it, like when we pour water from a bucket? In fact, heat continues to flow forever as long as a temperature difference is maintained. Heat vs. Temperature?
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Difference between Heat and Temperature? Temperature is a quantitative measure of “hotness” or “coldness”. Temperature also tells us which way heat flows Heat is a measure of total thermal energy; heat can be transferred from a hot object to a cold object Heat flow (Be able to distinguish between two closely related concepts)
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T 1 , m 1 , c 1 T 2 , m 2 , c 2 Before assume T 1 > T 2 Heat Flow Q Assume energy is conserved – no heat lost to surroundings T f , m 1 , c 1 T f , m 2 , c 2 After What’s T f ? How much heat flows?
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This note was uploaded on 04/23/2011 for the course PHYS 242 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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thermal_4_02_02_2011 - Heat Up until the early 1800s, heat...

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