Discussion
Assertion (A): A slip is normally aged for a period before it is used for casting.
Reason (R): Ageing releases entrained air and allows the dispersion to reach equilibrium.
Answer: D
Both are true and the reason gives both benefits: the rheology becomes stable and reproducible, so the casting time needed for a given wall thickness stops drifting from one batch to the next. Consistency of casting time is what a production line depends on.
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