Full name: femtometre
Plural form: femtometers
Alternate spelling: femtometres
Category type: length
Scale factor: 1.0E-15
The SI base unit for length is the metre.
1 metre is equal to 1.0E+15 femtometre.
Valid units must be of the length type.
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The SI prefix "femto" represents a factor of 10-15, or in exponential notation, 1E-15.
So 1 femtometre = 10-15 metre.