Lect9ME200Divs2&5PureSubstancesSP2012

Lect9ME200Divs2&5PureSubstancesSP2012 - ME 200:...

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ME 200: Thermodynamics I Lecture 9: Pure Substances, Evaluating Properties
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Last Lecture Cycles Power Cycles Refrigeration and Heat Pump Cycles
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This Lecture Pure Substance Phase Phase Change Property Diagrams
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Pure Substance A substance with a fixed chemical composition throughout e.g. water, N 2 , CO 2 etc. A single-phase mixture of various elements or compounds can be treated as a pure substance as long as the mixture is homogeneous throughout, air is the most important example A mixture of two or more phases is a pure substance as long as the chemical composition for each phase is the same e.g. ice-water mixture, water-vapor mixture
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Phase Three common phases: solids, liquids and gases Solids: molecules closely packed, strong molecular forces, definite shape and volume Liquids: molecules less closely packed (usually), weaker molecular forces, fluid shape and definite volume Gases: molecules move around, weakest molecular forces, no shape and container-defined volume Other states of matter that we will not discuss: plasmas, Bose-Einstein condensates, neutron stars
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This note was uploaded on 01/26/2012 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University-West Lafayette.

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Lect9ME200Divs2&5PureSubstancesSP2012 - ME 200:...

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