What is glass?
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The most common forms of glass are made from a melted mixture of silica (sand), sodium oxide and calcium oxide. Lead crystal is a form of glass in which the calcium oxide is replaced by lead oxide. The most heat-resistant glass can be made from pure silica.
Silica and limestone are melted in a furnace. The molten glass can be used to make bottles when it is blown into a mould. Flat glass sheets are made by allowing the hot, liquid glass to float on a pool of molten tin, which is perfectly flat, and then cooling it gradually. As it hardens, the glass is passed through rollers and cut to size.
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Date Added: 13 December '11
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