- Physical Chemistry I
Spring 2015, Unique 51170
Lecture Summary, 19 February 2015
based on configurations: Today we
continued our discussion of entropy based on the number of
configurations available to a thermodynamic system. We derived
an expression for increasing entropy with increasing volume.
We also saw explicitly that the third law of thermodynamics is a
direct consequence of Boltzmann's formulation for entropy. At
0 K, a perfectly pure crystalline substance has only one possible
configuration of the atoms in the crystal, and therefore the molar
entropy of the system is 0.