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What is glass made from?
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Glass is made from sand, limestone, soda ash (sodium carbonate), and recycled waste glass. Boric oxide is added to make heat-resistant glass (called Pyrex). The ingredients are heated to a high temperature in a furnace until they melt together. The molten glass from the furnace cools to form sheets, or may be moulded to make objects such as bottles. | | Glass is used to make thousands of items, from window panes to aerial shields in space vehicles. |
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Previous:
Back
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Book:
1001
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Section:
Science and Technology
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Chapter:
Materials
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