2300_les17

# 2300_les17 - VI Entropy A Introduction(lesson 17 is an alternative way of looking at entropy 1 Observation shows that isolated systems

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1 lesson 17 VI. Entropy A. Introduction (lesson 17 is an alternative way of looking at entropy) 1. Observation shows that isolated systems spontaneously change to a state of equilibrium. a. Two blocks of iron with T A1 > T B1 . Bring the blocks together and allow the system to come to equilibrium. At equilibrium, T A2 = T B2 . The first law says nothing about the direction of change . A B The system is A + B. Q in = 0 W in = 0 lesson 17 VI. Entropy A. Introduction 1. Observation shows that isolated systems spontaneously change to a state of equilibrium. b. Two chambers connected by a valve. Open valve and allow system to reach equilibrium. The system is A + B. Q in = 0 W in = 0 Vacuum P B1 =0 Air, P A1 , T A1 Ideal gas X A B At equilibrium, T A2 = T B2 and P A2 = P B2 . The first law is silent on the direction of change .

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2 lesson 17 VI. Entropy A. Introduction 2. The magic vortex tube – will it work? The first law says yes, but will it work? Magic Vortex Tube Compressed air 2 kg at 4 atm, 300 K Hot air 1 kg at 1 atm, 333 K Cold air 1 kg at 1 atm 273 K We need a quantitative answer. This suggests that we are looking for a property (like T, P, u, or volume). How can we find such a property?
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## This note was uploaded on 09/04/2009 for the course CHEM 2300 taught by Professor Thermo during the Summer '08 term at University of Utah.

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2300_les17 - VI Entropy A Introduction(lesson 17 is an alternative way of looking at entropy 1 Observation shows that isolated systems

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