# l01 - 20.110J 2.772J 5.601J Thermodynamics of Biomolecular...

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20.110/5.60 Fall 2005 Lecture #1 page 1 Introduction to Thermodynamics Thermodynamics: Describes macroscopic properties of equilibrium systems Entirely Empirical Built on 4 Laws and “simple” mathematics 0 th Law Defines Temperature (T) 1 st Law Defines Energy (U) 2 nd Law Defines Entropy (S) 3 rd Law Gives Numerical Value to Entropy These laws are UNIVERSALLY VALID , they cannot be circumvented. 20.110J / 2.772J / 5.601J Thermodynamics of Biomolecular Systems Instructors: Linda G. Griffith, Kimberly Hamad-Schifferli, Moungi G. Bawendi, Robert W. Field

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20.110/5.60 Fall 2005 Lecture #1 page 2 Definitions : System : The part of the Universe that we choose to study Surroundings : The rest of the Universe Boundary : The surface dividing the System from the Surroundings Systems can be: Open : Mass and Energy can transfer between the System and the Surroundings Closed : Energy can transfer between the System and the Surroundings, but NOT mass Isolated : Neither Mass nor Energy can transfer between the System and the Surroundings Describing systems requires: A few macroscopic properties: p, T, V, n, m, … Knowledge if System is Homogeneous or Heterogeneous Knowledge if System is in Equilibrium State Knowledge of the number of components 20.110J / 2.772J / 5.601J Thermodynamics of Biomolecular Systems Instructors: Linda G. Griffith, Kimberly Hamad-Schifferli, Moungi G. Bawendi, Robert W. Field
20.110/5.60 Fall 2005 Lecture #1 page 3 Two classes of Properties: Extensive : Depend on the size of the system (n,m,V,…) Intensive : Independent of the size of the system (T,p, n V V = ,…)

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• Spring '06
• LindaGriffith
• biomolecular systems, Linda G. Griffith, Robert W. Field, Moungi G. Bawendi, Biomolecular Systems Instructors

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l01 - 20.110J 2.772J 5.601J Thermodynamics of Biomolecular...

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