Discussion
Assertion (A): A trace of coarse material can dominate a volume-based size distribution while barely appearing in a number-based one.
Reason (R): Volume scales with the cube of diameter, so one large particle equals very many small ones.
Answer: A
Both are true and the reason gives the arithmetic: a single ten-micrometre particle balances a thousand of one micrometre, so a handful of coarse grains shifts the volume median considerably while the count barely moves.
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