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← ScienceWhich outcome during rapid cooling impedes glass tempering?
A)Tensile stress near the surface
B)Formation of crystalline structures✓
C)Uniform density distribution
D)Decreased thermal expansion coefficient
💡 Explanation
Crystallization hinders glass tempering because phase transition introduces structural defects. Differential thermal contraction exacerbates these flaws during quenching; therefore, temper strength decreases rather than increases due to uniform density or tensile stress changes.
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