The Glassy State - In Brief
1. THE GLASSY STATE
Glass is a state of matter.
Glasses combine some properties of crystals and some of liquids but are distinctly different from both.
Glasses have the mechanical rigidity of crystals, but the random disordered arrangement of molecules that characterizes liquids.
Glasses are usually formed by melting crystalline materials at very high temperatures. When the melt cools, the atoms are locked into a random (disordered) state before they can form into a perfect crystal arrangement.
My recollection of my college chemistry days weas that glass was considered "a supercooled liquid."