Less than the size of a fingernail.
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14 nanometers is a very fine process level, the accuracy is equivalent to 1‰ of a human hair, even if the inheritance of nearly 2 billion electronic tubes, the final molding area is only the size of a fingernail.
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Extension: 14 nm is actually a cut-off point for the chip process. 14 nm and above can be used by etching, and 14 nm and below can only be used by lithography.
It means more than 0.000014 mm.
This is a question of converting two units of length. We know that 1 nanometer is equal to 0.000001 mm, so there is 14 nanometers = 14×0.000001 mm = 0.000014 mm. Therefore, more than 14 nm means more than 0.000014 mm.