Lecture 9 PES Su 2011 annotated

Lecture 9 PES Su 2011 annotated - ME 200: Thermodynamics I...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 9: Evaluating Properties Prof. Sojka Summer 2011 2 In this Lecture Evaluating Properties 3 Phases and Pure Substance Phase Its homogeneous throughout in both chemical composition and physical structure . Pure Substance Its uniform and invariable in chemical composition . 4 Phases We have three: PhaseConstant PConstant T Solid T low p high Liquid T mid p mid Vapor (gas)T high p low 5 State Postulate How many independent intensive properties are necessary to fix a state ? For a simple compressible system (only boundary work) = number of independent intensive properties = number of substances in the system = number of phases in the system 2 6 Phases Compressed Liquid Pressure above boiling P (for given T), but below melting point. Pressure below boiling T (for given P), but above melting point. Saturated liquid It is one that is about to start boiling (or finish condensing). Saturated vapor It is one that is about to start condensing (or finish boiling).It is one that is about to start condensing (or finish boiling)....
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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 University-West Lafayette.

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Lecture 9 PES Su 2011 annotated - ME 200: Thermodynamics I...

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