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Glass
Glass

The materials definition of a glass is a uniform amorphous solid material, usually produced when a suitably viscous molten material cools very rapidly to below its glass transition temperature, thereby not giving enough time for a regular crystal lattice to form.

A simple example is when table sugar is melted and cooled rapidly by dumping the liquid sugar onto a cold surface.

The resulting solid is amorphous, not crystalline like the sugar was originally, which can be seen in its conchoidal fracture.



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