How many zeptometer in 1 handbreadth? The answer is 8.0E+19. We assume you are converting between zeptometre and handbreadth. You can view more details on each measurement unit: zeptometer or handbreadth The SI base unit for length is the metre. 1 metre is equal to 1.0E+21 zeptometer, or 12.5 handbreadth. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between zeptometers and handbreadth. Type in your own numbers in the form to convert the units!

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## Definition: Zeptometre

The SI prefix "zepto" represents a factor of 10-21, or in exponential notation, 1E-21.

So 1 zeptometre = 10-21 metre.

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