Glass is an arrested liquid that never truly freezes
Glass is an amorphous solid, not a true solid, which is why ancient church windows are thicker at the bottom after centuries of gravity slowly pulling the material downwards.
Windows do not melt in the sun, yet they lack the rigid, repeating atomic rows found in true solids like diamonds or salt. When glass is manufactured, it is cooled so quickly that the molecules are frozen in a state of chaotic disorder, much like a crowd of people suddenly paralyzed mid-step. Physicists call this an amorphous solid, a strange middle ground where the material is structurally a liquid but mechanically as hard as a rock.
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