Full name: femtogram
Plural form: femtograms
Category type: weight
Scale factor: 1.0E-18
The SI base unit for mass is the kilogram.
The SI derived unit for weight or force is the newton.
1 kilogram is equal to 1.0E+18 femtogram.
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The SI prefix "femto" represents a factor of 10-15, or in exponential notation, 1E-15.
So 1 femtogram = 10-15 grams-force.