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How will you show that glass is super co...

How will you show that glass is super cooled liquid ?

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If we examine carefully the window panes of an old building. We find that they are little thicker at the bottom. This due to the reason that glass has flown under the influence of gravity over the the years though very slowly. It has behaved liked liquid. Therefore, glass is a super cooled liquid.
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  17. How will you show that glass is super cooled liquid ?

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