ME 200 – Thermodynamics 1 Chapter 3 In-Class Notesfor Spring 2011Properties of Pure Substances•Phases of a pure substance•T-v and P-v diagrams•Properties tables for “real” fluids•Ideal liquid & solid properties•Ideal gas property modelsLt9Lecture 9Phase Changes and DiagramsPure Substance•A substance with fixed chemical composition throughout i.e. water, N2, He, CO2, etc.•A mixture of chemical elements or compounds is treated as a pure substance as long as mixture is homogeneous i.e. Air•A mixture of two or more phases is still a pure substance as long as chemical composition ofProperties - Page 1substance as long as chemical composition of each phase is same i.e. ice and liquid water but not liquid and gaseous airPhases of a Pure SubstanceSolid: molecules oscillate about “fixed” positionsLiquid: groups of molecules float about each otherGas: gas molecules move randomlyProperties - Page 2
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