Discussion
What is plate height?
Answer: D
Plate height is the length of column equivalent to one theoretical plate, so a small value means an efficient column. Inverting the ratio gives plates per metre, which is a related but distinct figure. Peak height and film thickness are quite different quantities. Expressing efficiency as a length lets columns of different lengths be compared directly, which a bare plate number cannot do. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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