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Why can a glass cup break for no reason?

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A glass cup never breaks for “no” reason. It breaks because a local stress becomes great enough to propagate a crack. This might be because of unequal thermal expansion, such as when you heat half a glass of water in a microwave. read more

Spontaneous glass breakage is a phenomenon by which toughened glass (or tempered) may spontaneously break without any apparent reason. The most common causes are: Minor damage during installation such as nicked or chipped edges later developing into larger breaks normally radiating from point of defect. read more

The breaking of the glass is even in a higher pitch that a human voice therefore is more likely to be noticed in a room with several people. This is because the sound of breaking glass is no sharing the same frequencies with the human voice, no voice is gonna cover it. It stands on its own. I don’t share the same view on the psychological effect. read more

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