category img 00 00 00 51

Glass

Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent.

The most familiar type of glass, used for centuries in windows and drinking vessels, is soda-lime glass, composed of about 75% silica (SiO2) plus Na2O, CaO, and several minor additives. Often, the term glass is used in a restricted sense to refer to this specific use.

In science, however, the term glass is usually defined in a much wider sense, including every solid that possesses a non-crystalline (i.e., amorphous) structure and that exhibits a glass transition when heated towards the liquid state. In this wider sense, glasses can be made of quite different classes of materials: metallic alloys, ionic melts, aqueous solutions, molecular liquids, and polymers. For many applications (bottles, eyewear) polymer glasses (acrylic glass, polycarbonate, polyethylene terephthalate) are a lighter alternative to traditional silica glasses.

volume cubic metre



Name Type Mask / Range of values Measure


Moderator Kate Koltunova is not responsible any longer for the category Glass

Avatar picture Kate Koltunova
0

Category Glass has been updated

Avatar picture Kate Koltunova
0

Moderator David Oshakmashvili is responsible for the category Glass

Avatar picture Kate Koltunova
0

Category Glass has been updated

Avatar picture Elena Shestakova
+1

Category Glass has been updated

Avatar picture Mike Gurfing
0