Discussion
Assertion (A): A body that is fully vitrified is close to the temperature at which it will deform.
Reason (R): The glassy phase that closes the porosity also softens the body as its quantity increases.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the same fact seen from two sides. Porosity closes because the liquid phase fills it, and as the temperature rises further that liquid increases in quantity and falls in viscosity until the piece can no longer support itself. Full vitrification is therefore near the deformation point by construction, and the firing range is the gap between them.
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