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Give the reason behind the following. ...

Give the reason behind the following.
i) The glass window pannels of old buildings are thicker at the bottom than at the top.

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Glass is not a true solid, but a super C0oled liquid of high visC0sity (called pseudo - solid). It has the property to flow.
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  9. Why is potassiumchloride sometimes violet instead of pure white?

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  10. Schottky and frenkel defects are stoichiometric defects. When pure NaC...

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  11. Though glass and quartz are both made up of SiO4 they differ structura...

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  15. Why are amorphous solids are considered as super cooled liquids?

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  16. ZnO appears yellow on heating.

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  17. The defects of crystalline solids are called thremodynamics defects. W...

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  18. Why is Frenkel defect not found in alkali metal halides?

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