Chapter 3 Pure Substance Behaviour.pdf

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Curtin University
Mechanical Engineering
Chris Ford

Chapter 3: Pure Substance Behaviour Monday, 11 November 2013 10:41 AM The Pure Substance • Pure substance: has homogeneous and invariable chemical composition • Water is always a pure substance, whether it is in liquid, solid or vapour form • A mixture of gases is considered a pure substance as long as there is no change in phase • Compressible substances: surface effects, magnetic effects and electrical effects are insignificant when dealing with them Vapour-Liquid-Solid phase equilibrium in a pure substance T=T1 T2>>T 1 T3=T2 T4>>T 3 P=P 1 P2=P 1 P3=P 2 P4=P 3 v=v1 v2>v1 v3>v2 v4>v 3 V=V 1 V2>>V 1 V3>>V 2 V4>>V 3 Heat is added Heat added Heat added • Saturation temperature: temperature at which vaporisation will take place at a given pressure (eg. T & T ) 2 3 • Saturation pressure: pressure at which vaporisation will take place at a given temperature (eg. P & P ) 2 3 • Saturated substance: a substance at saturation temperature and pressure; exists as part liquid and part vapour • Subcooled (compres
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