Lecture25 - PHYSICS 220 Lecture 25 Heat Textbook Sections...

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Lecture 25 Purdue University, Physics 220 1 Lecture 25 Heat Textbook Sections 14.1 - 14.5 PHYSICS 220
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Lecture 25 Purdue University, Physics 220 2 Overview • Last Lecture – Ideal Gas Law PV = n R T • P = pressure in N/m 2 (or Pascals) • V = volume in m 3 • n = # moles • R = 8.31 J/ (K mole) • T = Temperature (K) – Kinetic Theory of Monatomic Ideal Gas • <K tr > = 3/2 k B T • Today – Heat – Specific Heat – Phase Transitions
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Lecture 25 Purdue University, Physics 220 3 Internal Energy Energy of all molecules including – Translational and rotational kinetic energy of molecules due to their individual random motions. – Vibrational energy (both kinetic and potential) of molecules and of atoms within molecules due to random vibrations about their equilibrium points. – Potential energy due to interactions between the atoms and molecules of the systems. – Chemical and nuclear energy (kinetic and potential energy associated with the binding of atoms to form molecules, the binding of electrons to nuclei to form atoms, and the binding of protons and neutrons to form nuclei). DOES NOT INCLUDE – Macroscopic motion of object – Potential energy due to interactions with other objects
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Lecture 25 Purdue University, Physics 220 4 Heat • Definition: Flow of energy between two objects due to difference in temperature – Note: similar to WORK – Object does not “have” heat (it has energy) • Units: calorie – Amount of heat needed to raise 1g of water 1ºC – 1 Calorie = 1 kcal = 1000 cal = 4186 Joules • Heat flows from a system at higher temperature to one at lower temperature
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Lecture 25 Purdue University, Physics 220 5 Exercise After a grueling work out, you drink a liter of cold water (0 C). How many Calories does it take for
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This note was uploaded on 09/17/2010 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue University-West Lafayette.

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Lecture25 - PHYSICS 220 Lecture 25 Heat Textbook Sections...

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