Glasses
(t.d. ayyar)
Glass is one of the most useful materials in the world. Few manufactured substances add as much to modern living as does glass. Yet few products are made of such inexpensive raw materials. Glass is made chiefly from silica sand (silica, or silicon dioxide), soda ash (sodium carbonate), and limestone (calcium carbonate).
Glass has countless uses. Food is preserved in glass jars. People drink liquids from glass tumblers called glasses. Windows in homes, schools, and office buildings are glass. Most modern vehicles have glass windscreens and windows. People with sight problems wear eyeglasses. Scientists use glass test tubes, containers, and thermometers. They have glass lenses in their microscopes and telescopes.
Besides being useful, glass is also ornamental. Ever since people learned how to make glass, they have used it as an art material.
Glass can take many different forms. It can be spun finer than a spider web. But glass can also be moulded into a telescope lens or mirror weighing many tons. It can be stronger than steel, or more flimsy than paper. Most glass is transparent. Glass can alsoWrite your abstract here.
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