Discussion
Annealing of glass is carried out in order to
Answer: D
Correct answer: remove internal stress by slow cooling
A formed article cools unevenly, so the outside solidifies while the inside is still contracting, leaving locked-in stress that can crack the piece spontaneously or on the slightest scratch. Annealing reheats it just below the softening point and cools it slowly through the stress range, letting the glass relax. It is the opposite of toughening, which deliberately imposes a stress pattern.
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