Discussion
Assertion (A): Cooling through the quartz inversion is more dangerous than heating through it.
Reason (R): The ware is rigid and brittle on cooling, whereas on heating it is still relatively weak and unbonded.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. Quartz changes volume abruptly at 573 degrees in both directions, but on the way up the body is still weak and open and can accommodate the movement. On the way down it is a rigid, fully bonded ceramic, so the same volume change generates stress it cannot relieve. That is why firing schedules slow markedly through 573 degrees on cooling.
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