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 sodium oxide Na2O from soda ash, lime 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.

Read more about Glass:  Silicate Glass, Structure, Glass Versus Supercooled Liquid, Glass Art

Famous quotes containing the word glass:

    “Lay down, lay down the bigly bier,
    Lat me the dead look on;
    Wi’ cherry cheeks and ruby lips
    She lay an’ smil’d on him.

    O ae sheave o’ your bread, true-love,
    An’ ae glass o’ your wine,
    For I hae fasted for your sake
    These fully day [is] nine.”
    —Anna Gordon Brown (1747–1810)

    “In the woods in a winter afternoon one will see as readily the origin of the stained glass window, with which Gothic cathedrals are adorned, in the colors of the western sky seen through the bare and crossing branches of the forest.”
    —Ralph Waldo Emerson (1803–1882)

    “Thales claimed that everything was water. He also put wine into water to sterilize it. Did he really believe he was putting water into water to sterilize it? Parmenides, like most Greeks, knew that wine was not water. But while lifting a glass of wine to his lips, he denied that motion was possible. Did he really believe that the glass was not moving when he lifted it?”
    —Avrum Stroll (b. 1921)