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studyguideproerties - Study Guide Properties of Pure...

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1 Study Guide Properties of Pure Substances ( prepared by JCO. Mostly from M.Boles Study Guide) We now turn our attention to the concept of pure substances and the presentation of their data. Simple System A simple system is one in which the effects of motion, viscosity, fluid shear, capillarity, anisotropic stress, and external force fields are absent. Homogeneous Substance A substance that has uniform thermodynamic properties throughout is said to be homogeneous. Pure Substance A pure substance has a homogeneous and invariable chemical composition and may exist in more than one phase. Examples: 1. Water (solid, liquid, and vapor phases) 2. Mixture of liquid water and water vapor 3. Carbon dioxide, C02 4. Nitrogen, N 2 5. Air is treated as a pure substance as long as there is no change of phase, even though it is a mixture of gases. State Postulate Again, the state postulate for a simple, pure substance states that the equilibrium state can be determined by specifying any two independent intensive properties.
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3 Looking at the PvT surfaces from different views we get very useful diagrams: T- v, P,v and p-T ( often called phase-diagram): It is important to memorize the basic features of those 2-D diagrams (names, regions, how do the constant pressure and constant temperature lines look like, in a T-v diagram draw a constant pressure line, and then you should be able to locate a constant pressure line that corresponds to a higher pressure and to a lower pressure). Make sure you can draw a diagram and indicate on it those basic features.
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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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studyguideproerties - Study Guide Properties of Pure...

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