lec 3 - system? Ideal Gas Equation of State p = RT where R...

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Phases, Ideal Gases, p-v-T Diagrams Phase - Matter that is homogeneous in chemical composition and physical structure. Examples: Pure Substance - Matter that is uniform and invariable in chemical composition. Is air a pure substance? Simple Compressible Systems Systems containing pure substances or mixtures of non-reacting gases. State Principle – For simple systems the values for only two intensive properties are needed to fix the state. Typical set of intensive var. are: . The number of indep. properties is 1+ the number of relevant quasi-equilibrium work processes. What is the relevant work process(es) for a simple compressible
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Unformatted text preview: system? Ideal Gas Equation of State p = RT where R is the universal gas constant pV = mRT since = V/m V is system volume, m is mass p = RT since = /M, R = R/M M is the molecular wt. pV = nRT since = V/n n is the number of moles Values for the universal gas constant R = 8.314 kJ/kmol K R = 1.986 Btu/lbmol R R = 1545 ft lbf/lbmol R Assumptions that go along with the Ideal Gas Model 1. 2. p v T Diagrams p-v and v-T diagrams often prove useful in solving thermo problems Features: Single-phase regions, Two-phase regions, Triple line, Saturation states, Vapor dome, Critical point....
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This note was uploaded on 10/05/2011 for the course ME 2124 taught by Professor Uzgoren during the Spring '08 term at Virginia Tech.

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lec 3 - system? Ideal Gas Equation of State p = RT where R...

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