1.Why does a hot glass tumbler crack if we put it under a running tap?
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1.Why does a hot glass tumbler crack if we put it under a running tap?
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Explanation:
That creates an uneven thermal profile, where the surface is cold but the inside is hot. As a result, the surface shrinks! Or it tries to. The hot inner glass prevents the surface glass from shrinking.
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Answer:
Glass shrinks a little when it cools. By putting a hot glass into cold water, you are forcing it to shrink faster on the surface than inside the walls of the tumbler. Essentially the glass is cracking to relieve the stress created by that shrinkage.