Discussion
Consider the following statements about aperture shape:
1. A round hole sorts on particle width.
2. A slot sorts on particle thickness.
3. Either shape can be used to sort on length.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 give the two aperture shapes correctly: a round hole passes a particle only if its width will go through, and a slot passes it only if its thickness will. Statement 3 is wrong - no aperture can sort on length, since a long particle passes end-on as readily as a short one, which is why length separation needs an indented cylinder or a disc separator.
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