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The average length of an onion cell ranges from 0.25 mm or 250 microns to 0.4 mm or 400 microns. No one has actually measured the width of an onion cell but from the diameter of the field of view in a microscope and comparing the length to the width, I would say that the width is about a quarter or third of the length. Therefore, the width would have to be somewhere between 0.06 to 0.08 mm.

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Q: Average length and width of onion epidermal cells?
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