Glass is an inorganic liquid material which has solidified and become rigid without forming a regular crystalline structure. Instead it has a random, liquidlike (non-crystalline) molecular structure, whose atoms are frozen in position. Thus, glass "freezes" the atomic structure of the liquid.

The manufacturing process requires the raw materials to be melted, and then cooled rapidly.

Glasses are generally hard, perfectly elastic, and brittle. They are transparent but refract the light and are electrical insulators as well as being very resistant to corrosion and ageing.

Glass typePrice (DKK/kg)Density (kg/liter)
Aluminosilicate glass--
Borosilicate glass (pyrex)--
Common glass--
Fused silica glass--

References The Corning Museum of Art
Is glass liquid or solid? (Philip Gibbs)
For materials in general see also:
Machine Design On-line
Materials by Design
ViMS (Visualizations in Material Science)
Photo Thomas Nissen (Computer graphics)

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