week10_part_a

week10_part_a - Lecture notes Week 10, part (a). Properties...

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1 Lecture notes Week 10, part (a). Properties of a Pure Substance Pure substance: homogeneous, uniform chemical composition. A pure substance may exist in more than one phase. VAPOR LIQUID SOLID A substance may coexist in any two or three phases Properties : pressure ( p ), specific volume ( v ), and temperature ( T ) Phase equilibrium : Consider a thought experiment of a phase change from a liquid phase to a vapor phase at constant pressure. Consider the following experiment: take a cylinder with some liquid water cover it with a frictionless piston place a weight on top of the piston heat the water in the piston This will be a constant pressure process. The weight on top of the piston determines the pressure exerted on the contents in the cylinder below the piston. Observe the temperature and phase of the water as more and more heat is added. Q , heat added piston weight (for constant pressure) cylinder liquid water Vapor H 2 O Liquid H 2 O
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2 vapor bubble, first appearance of vapor liquid drop, last remnant of liquid COMPRESSED LIQUID SUPERHEATED VAPOR SATURATED LIQUID – VAPOR Specific volume, v T e m p e r a t u r e, SATURATED LIQUID SATURATED VAPOR Constant pressure line
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3 Conduct the above experiment at many different pressures and plot similar constant pressrue lines, noting when first vapor appears (saturated liquid point) and the last drop of liquid disappears (saturated vapor poit).
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This note was uploaded on 07/21/2011 for the course EML 3100 taught by Professor Staff during the Summer '10 term at FSU.

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week10_part_a - Lecture notes Week 10, part (a). Properties...

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