Glasses are amorphous (non-crystalline) solid materials (most commonly silicates). The nature of the glass transition between a fluid or regular solid and a glassy phase is poorly understood.
According to (late) Professor Philip Warren Anderson :
The deepest and most interesting unsolved problem in solid state theory is probably the theory of the nature of glass and the glass transition.“
Source : Through the glass lightly Science,17 March 1995.
Also see: Glass at Wikipedia.
Note: Glasses do not normally 'flow' at ambient temperatures. The much cited fact that ancient glass windows are often thicker at the bottom is explained because glaziers fitted them that way - heavy-end downwards.
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