Discussion
Assertion (A): Two different instruments can report different mean sizes for the same powder.
Reason (R): Each reports the diameter of a sphere equivalent in whatever property that technique measures.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. A real particle is not a sphere, so every technique reports the diameter of the sphere that would behave identically in whatever it measures - the same scattering pattern, the same settling velocity, the same displaced volume. A plate-shaped particle therefore has one equivalent diameter by sedimentation and quite another by laser diffraction, and neither is wrong.
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