ME 166 Presentation 3 06-02-2012

ME 166 Presentation 3 06-02-2012 - ME166 THERMODYNAMICS 1 D...

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ME166 THERMODYNAMICS 1 D. A. Quansah
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INTRODUCTORY CONCEPTS AND DEFINITIONS Property Path and Point Functions The value of a property of a system is independent of the path of the process undergone by the system and is therefore referred to as a point function (also called state function) . Quantities such as heat and work which are not properties of the system and dependent on the path of the process undergone by the system are classified as path functions .
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INTRODUCTORY CONCEPTS AND DEFINITIONS Property Path and Point Functions If X is a property, then the change in its value is independent of path, hence: This requires that dX be an exact differential X 2 -X 1 represents the change in the property as the system changes from state 1 to state 2.
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INTRODUCTORY CONCEPTS AND DEFINITIONS Property Path and Point Functions Quantities such as heat and work which are not properties of the system and dependent on the path of the process undergone by the system are classified as path function .
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