Question : Heat resistant variety of Glass is ____.
Option 1: Pyrex glass
Option 2: Haed glass
Option 3: Flint glass
Option 4: None of these
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Correct Answer: Pyrex glass
Solution : The correct answer is Pyrex glass.
Glasses are formed of silica. Although glass do not have any sharp melting point but it melts slowly because of heat. Because of this phenomenon glasses of windows become thick at bottom and thin at upper portion. Pyrex is the heat resistant variety of glass. It is a borosilicate and was invented by Corning Glass Works Corporation.
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