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lecture2-completed - Prof.Naik 2011 ME 200 Thermodynamics I...

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Prof.Naik © 2011 ME 200: Thermodynamics I Lecture 2: Basic Thermodynamic Concepts
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Last Lecture Prof.Naik © 2011 What is thermodynamics? » Study of energy transformations » Relationships among physical quantities of different substances affected by such transformations substances affected by such transformations Two approaches » Classical thermodynamics: macroscopic (considers large scale behavior) » Statistical thermodynamics: microscopic (considers molecular scale behavior) In ME200, we focus on understanding large scale behavior using statistical view in a supporting role Dimensions and units
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This Lecture Prof.Naik © 2011 Discuss some terms and concepts commonly used in Discuss some terms and concepts commonly used in thermodynamic analysis » System » Property » State » Equilibrium » Process » Pressure
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System Prof.Naik © 2011 What is thermodynamic system? » Any arbitrary region selected for thermodynamic analysis What is surroundings? » The region of space outside the boundaries of the chosen thermodynamic system System boundary may be real/imaginary ; it could be stationary/moving Identification of system and its surroundings is the most critical first step to begin thermodynamic analysis
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Types of Systems Prof.Naik © 2011 System interacts with its surroundings in two possible ways » Exchange of mass across boundary » Exchange of energy across boundary Closed System allows transfer of energy only across its boundaries; no mass interaction » Chemical composition within the system may change; b t i t t ( l h ) but mass remains constant (volume may change) » Closed System = Control Mass
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