The particles of a solid are arranged in a regular, repeating pattern called a crystal lattice. Each particle is confined to a specific location within the lattice and can only vibrate about its mean position. As the temperature decreases, the amplitude of these vibrations decreases. However, the particles are still able to move around and change positions within the lattice.

At -273.15 Celsius:

This temperature is known as absolute zero, which is the coldest temperature that is theoretically possible. At this temperature, all molecular motion stops. The particles of a solid are completely still and have fixed positions within the crystal lattice. This state is known as Bose-Einstein condensate.