Discussion
Assertion (A): Hot pressing is used despite producing only simple shapes one at a time.
Reason (R): It reaches full density at lower temperature and so gives a finer grain size.
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 why the drawbacks are accepted. Applied pressure adds to the capillary driving force, so full density is reached at a lower temperature and in less time - and since grain growth depends far more steeply on temperature than densification does, the grains stay fine. For a ceramic whose strength depends on grain size, that microstructure justifies producing one simple shape at a time.
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