For 10 points, name this transparent material found in windows.
Boron oxide is used to lower the thermal expansion rate of this material. Usually sodium carbonate and calcium carbonate are added in production of this material, making the soda-lime type. Like metals, it can tempered in order to increase its thermal shock resistance and change its (*) break pattern. This amorphous substance is non-crystalline, and it does have the characteristics of a solid despite misconceptions that it is a liquid. It is primarily composed of silica. For 10 points, name this transparent material found in windows.
Boron oxide is used to lower the thermal expansion rate of this material.
glass