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Why do the window glass of old old building (a) look milky and (b) become thick at the bottom? |
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Answer» a. Due to heating during the day and cooling at night, i.e., annealing over a number of years, glass acquires some crystalline character. b. Glass is not a true solid but a super cooling liquid of high viscosity (called pseudosolid). Therefore, it has the property to flow (i.e., fluidity). |
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