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A micron is a unit of length. It is 1 / 1,000,000 of a metre. A millimetre = 1 / 1,000 of a metre, so a micron = 1 / 1,000 of a millimetre. A sheet of A4 meaures 210 by 297 millimetres So, there are 210,000 microns along the short side, and 297,000 along the long side.

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16y ago

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