Huma Notes - Free Energy and Diffusion Chapter V Free...

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Unformatted text preview: Free Energy and Diffusion Chapter V Free Energy Natural tendency: All systems exhibit a tendency to lower their energy to achieve a more stable configuration. Energy intends to be minimized. e.g. water in the dam, a stone at hill,... Free Energy and Diffusion Chapter V Natural tendency There is another tendency in the nature, All systems tend to disorder themselves. e.g. a group people in the playground, two kinds of ball mixed in a box ,... Special term to describe the tendency: Entropy ( S ) Free Energy and Diffusion Chapter V Free energy : a parameter to represent the natural tendency. G = H- T S G: Gibbs free energy . When G tends to minimum, a material reach the most stable state (equilibrium state). H : Represents internal energy of a material. T S : The entropy factor which has same units of energy temperature Free Energy and Diffusion Chapter V Free energy reduction the driving force for change from state 1 to state 2 G = G 2 G 1 Free Energy and Diffusion Chapter V Free energy concept can explain why crystal is not perfect. Equilibrium Vacancy Concentration Free energy reaches minimum with certain percentage of vacancy concentration. No. of Vacancies H G No. of Vacancies S G G = H- T S Minization of free energy requires a vacancy concentration which balances influences of H and S. Free Energy and Diffusion Chapter V Diffusion Diffusion is commonly referred to as such movement of atoms or molecules in solid or liquid....
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This note was uploaded on 10/25/2011 for the course HUMA 002 taught by Professor Yu during the Spring '11 term at Alcorn State.

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Huma Notes - Free Energy and Diffusion Chapter V Free...

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