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Which consequence results when rapid heating causes non-uniform thermal expansion in tempered glass?

A)Increased density near heated areas
B)Spontaneous shattering due to tensile stress
C)Enhanced impact resistance, local compression
D)Visible flow as structure softens slowly

💡 Explanation

Tensile stress rises during differential heating; since tempered glass has pre-existing high compression, rapid expansion overcomes it, initiating fracture via *thermal shock*. Therefore, spontaneous shattering occurs; rather than densification or local compression, because those would mitigate the net stress.

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