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."
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Your urban legend is about to be trumped by the Cornell Museum of Glass
No, it isn't. Nothing in your link states that glass is a liquid. It only says that it has *disordered molecules* like most liquids do, but that's not the same as saying that it *is* a liquid. Having disordered molecules is not what makes something a liquid -- having *mobile* molecules in contact with each other is.