L08 Ch05 Thermo - Proper Usage Most of the graphics in...

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Proper Usage Most of the graphics in these slides, used to illustrate lectures in GEO 426P, are teaching aids provided by John Winter, the author of An Introduction to Igneous and Metamorphic Petrology , and modified by me to suit our purposes. You may download these slides to review on- screen, and may print out a single copy for study, but it would be inappropriate to further disseminate them or the images they contain.
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Thermodynamics and the Phase Rule
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Thermodynamics A system: Some portion of the universe that you wish to study The surroundings: The adjacent part of the universe outside the system Changes in a system are associated with the transfer of energy. Natural systems tend toward states of minimum energy.
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Energy States Unstable: any perturbation causes transition to lower energy state Metastable: small perturbations leave state unchanged; large perturbations cause transition to lower energy state Stable: in lowest energy state
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… is a measure of energy that is particularly useful for analyzing geochemical systems. All systems tend naturally toward states of minimum Gibbs free energy. G = H - TS
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This note was uploaded on 02/21/2010 for the course GEO 420k taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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L08 Ch05 Thermo - Proper Usage Most of the graphics in...

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