Discussion
Assertion (A): A pilot plant is built before committing to full scale.
Reason (R): Scale-up rarely behaves exactly as calculation predicts.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Because scale-up rarely behaves as calculated - heat transfer, mixing, handling and fouling all change with size - an intermediate step is worth its cost. The pilot plant is where those surprises are found cheaply, which is precisely why it is built.
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