To convert petameters (Pm) to millimeters (mm), you need to multiply the value in petameters by 1e+18.
So, to convert 1.4e-15 Pm to mm: 1.4e-15 Pm * 1e+18 = 1400 mm
Therefore, 1.4e-15 petameters is equal to 1400 millimeters.
This below table contains list of length units and conversion values:
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