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3473-11 Lecture Outline 3

3473-11 Lecture Outline 3 - 3 1 of 3 CHE 3473 Fa11 Whiteley...

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3 – 1 of 3 CHE 3473 – Fa11 Whiteley Lecture 3 (8/26/11) Assigned Reading Foundation Concepts - continued Smith, Van Ness, Abbott 7 th ed. (SVNA7) Ch. 2, pp. 28-37 Assignments Handouts (on web unless stated otherwise) HW #0 due -- HW #1 due Wed, Aug 31 Outline 1. Complete Lecture 2 2. Thermodynamic state and thermodynamic coordinates. 3. Path dependency 4. Independent and dependent variables, total derivative 5. Phase rule for non-reacting systems 6. Extensive and intensive thermodynamic variables Key Concepts 1. Nature is reliable (in terms of how things work) and relentless in the drive to achieve a single common state for everything in the universe. 2. The reliability of nature is reflected in the existence of “thermodynamic states.” 3. In general, the “state” of a process corresponds to a snapshot of the intensive process variable values at a specific point in time. For purposes of focus, the field of thermodynamics disregards time and views the world through “steady-state” glasses. Consequently, “thermodynamic states” can be associated with steady-state systems. 4. Thermodynamic state variables are intensive variables (value is independent of the amount of material present). 5. For mental image purposes, a “state” can be viewed as a point on a graph. The graph variables on the X and Y axes are the “thermodynamic coordinates” used to define the point.
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