Full name: attometre
Plural form: attometers
Alternate spelling: attometres
Category type: length
Scale factor: 1.0E-18
The SI base unit for length is the metre.
1 metre is equal to 1.0E+18 am.
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The SI prefix "atto" represents a factor of 10-18, or in exponential notation, 1E-18.
So 1 attometre = 10-18 metre.