Amorphous solid

In condensed matter physics and materials science, an amorphous solid (or non-crystalline solid) is a solid that lacks the long-range order that is a characteristic of a crystal. The terms "glass" and "glassy solid" are sometimes used synonymously with amorphous solid; however, these terms refer specifically to amorphous materials that undergo a glass transition. Examples of amorphous solids include glasses, metallic glasses, and certain types of plastics and polymers.

Extends: [Amorphous solids](https://wikipedia.org.ai/Amorphous solids), [Phases of matter](https://wikipedia.org.ai/Phases of matter), [Unsolved problems in physics](https://wikipedia.org.ai/Unsolved problems in physics)