Actually, a similar distinction is important in thermodynamics as well. Even at 0K (with no movement of atoms), you can still have a "residual entropy" related

Actually, a similar distinction is important in thermodynamics as well. Even at 0K (with no movement of atoms), you can still have a "residual entropy" related to the randomness in the crystal structure. For example, a solid CO crystal at 0K still has disorder in the direction the molecule is oriented (possible because the C-O dipole is small but nonzero). http://images.slideplayer.com/24/7362502/slides/slide_18.jpg http://images.slideplayer.com/24/7362502/slides/slide_18.jpg