What is an amorphous material?

In this video we look at the basic definition of an amorphous material - how they are defined, why they should really be considered as viscous liquids, and why they have different physical properties from crystalline materials. There is a related video that discusses crystalline materials that you can see here;    • What is a crystalline material?   If there are other topics you'd like me to discuss, please note them in the comments section below.