Q4 of 68 Page 4

Why is glass considered a super cooled liquid?

Glass is an amorphous solid and all the amorphous solids have a tendency to flow, though very slowly. Hence glass is considered a super cooled liquid and that becomes the reason why the glass windows become slightly thicker at the bottom that at the top over a period of time.

Explanation: All amorphous solids have tendency to flow as rubber, plastic.


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Why do solids have a definite volume?

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Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

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Refractive index of a solid is observed to have the same value along all directions.

Comment on the nature of this solid. Would it show cleavage property?

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Classify the following solids in different categories based on the nature of

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Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide,


graphite, rubidium, argon, silicon carbide.