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Unformatted text preview: ME 200: Thermodynamics I Lecture 13: Compressibility Chart and Ideal Gas Model H. Finney Summer 2011 2 In this Lecture … • We will study: – Compressibility Chart – Ideal Gas Model 3 Recall Ideal Gas • What is R? • What are the units of R? 3 mRT PV T R n PV 4 When is a Gas not Ideal? • When the gas is very near the saturated vapor line. • Ideal gas behavior will occur when the density is “low”. 4 5 What Can We Do? • The Principle of Corresponding States says that p nT behavior of many gases is identical if T and P are scaled (divided) by the critical properties T c and P c . 5 ZRT P c c P P T T f Z , 6 Z  factor • As with many problems, we prefer to have our equations in dimensionless form . • To do this, we define a reduced P (P R ) and a reduced T (T R ) . 6 c R P P P c R T T T R R T P f Z , 7 Z  factor • Z is a complicated function so it’s provided in graphical form....
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This note was uploaded on 09/26/2011 for the course ME 200 taught by Professor Gal during the Summer '08 term at Purdue.
 Summer '08
 GAL

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