Lecture_04_02_01_2012

# Lecture_04_02_01_2012 - Heat Ron Reifenberger R R f b Birck...

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eat Heat Ron Reifenberger Birck Nanotechnology Center Purdue University February 1, 2012 Lecture 4 1

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What is Heat? Up until the early 1800’s, heat was thought to be an invisible fluid that flowed out of one object and into nother Now we know that heat energy is another. Now we know that heat energy is associated with the motion of molecules and atoms inside an object. misconception 2
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 orever as long as a temperature forever as long as a temperature difference is maintained. Heat vs. Temperature? 3

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ifference between Heat and Temperature? Difference between Heat and Temperature? Temperature is a quantitative measure of “hotness” or “coldness”. emperature also tells us which way Temperature also tells us which way heat flows Heat is a measure of total thermal energy; heat can be transferred from gy; f f a hot object to a cold object Heat flow (Be able to distinguish between two closely related concepts) 4
The General Heat Flow Problem m T , m Before T 1 , m 1 2 2 assume T 1 > T 2 T f , m 1 T f , m 2 After touching Heat Flow Q hat’s T Assume energy is conserved – no heat lost to surroundings What s T f ?

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Lecture_04_02_01_2012 - Heat Ron Reifenberger R R f b Birck...

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