Reference Terms
from Wikipedia, the free encyclopedia

Glass

The materials definition of a glass is a uniform amorphous solid material, usually produced when a suitably viscous molten material cools very rapidly.

Naturally occurring glass, such as obsidian, has been used since the stone age.

Note:   The above text is excerpted from the Wikipedia article "Glass", which has been released under the GNU Free Documentation License.
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May 25, 2015

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