Entropy

• Entropy – usually termed S - is a well-defined measure of disorder

  • Can be defined in terms of the number of configurations for any system – for example, the flipped pennies
  • Defined by Boltzmann for systems of atoms

• Larger entropy means more disorder

• The statement that disorder tends to increase is the same as the statement that entropy increases

• Entropy provides a quantitative measure of the increase in disorder

  • NOT done here

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