2.2 The Einstein Model of a Solid
=================================

https://www.youtube.com/watch?v=71fk3n88t48&list=PLMcpDl1Pr-vjXYLBoIULvlWGlcBNu8Fod&index=16

.. raw:: html

  <iframe width="560" height="315" src="https://www.youtube.com/embed/71fk3n88t48" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>