Lecture_Nov_3

Lecture_Nov_3 - Weeks 10/11: Properties of Pure Substances...

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Weeks 10/11: Properties of Pure Substances 3 1 Pure Substance 3 2 Phases of a Pure Substance 3 3 Phase-Change Processes of Pure Substances 3 4 Property Diagrams: PVT surface, Pv diagram, Tv diagram, PT diagram (phase diagram) 3 5 Property Tables Interpolation
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Pure Substance A substance that has a fixed chemical composition throughout is called a pure substance . Ex: Water, nitrogen, helium, and carbon dioxide, for example, are all pure substances. A mixture of ice and liquid water, for example, is a pure substance because both phases have the same chemical composition. A mixture of liquid air and gaseous air, however, is not a pure substance since the composition of liquid air is different from the composition of gaseous air, and thus the mixture is no longer chemically homogeneous.
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3 2 Phases of Pure Substance A phase is identified as having a distinct molecular arrangement that is homogeneous throughout and separated from the other by easily identifiable boundary surfaces. Solid Liquid gas Phase State
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3 3 Phase Change Processes of Pure Substances Water will be used to demonstrate the basic principles that phase change is involved. Water at 20 o C and 1 atm pressure is in compressed (or subcooled) liquid state, meaning that it is not about to vaporize. When water temperature reaches 100 o C (at 1atm), it is about to vaporize is called a saturated liquid . Once boiling starts, the temperature will stop rising
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Lecture_Nov_3 - Weeks 10/11: Properties of Pure Substances...

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